Re: Recommendations for digital grey card
On Fri, 10 Aug 2007 08:54:54 -0700, Godfrey DiGiorgi wrote I bought a WhiBal card because there are times when it would be useful to have a reliable white/gray/black reference in a test frame when I'm doing post processing. I never manually set a white balance in the camera, it's a waste of time unless you're using JPEG capture, and I only use RAW capture. If I need to calibrate a camera for accuracy, a gray card isn't going to be much use... G Sorry for not replying sooner, just had to reformat the PC! PITA. Thanks for the advice and recommendations everyone, I may try and locate a Whibal card over here in the UK. Regards, John The information transmitted is intended only for the person to whom it is addressed and may contain confidential and/or privileged material. If you have received an email in error please notify Carmel College on [EMAIL PROTECTED] then delete all copies of it from your systems. Although Carmel College scans incoming and outgoing emails and email attachments for viruses we cannot guarantee a communication to be free of all viruses nor accept any responsibility for viruses. Although Carmel College monitors incoming and outgoing emails for inappropriate content, the college cannot be held responsible for the views or expressions of the author. The views expressed may not necessarily be those of Carmel College and Carmel College cannot be held responsible for any loss or injury resulting from the contents of a message. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
On Sat, 11 Aug 2007 11:06:51 -0400, David J Brooks wrote Sorry for not replying sooner, just had to reformat the PC! PITA. Thanks for the advice and recommendations everyone, I may try and locate a Whibal card over here in the UK. No paper towels in the UK,:-) Dave Plenty, but I've been making do for so long that for the cost of a decent grey card I thought I may as well enable myself, need a Stofen Omnibounce as well. I've got a day of group shots coming up in a few weeks that I need to be accurate with, as always (I do this anually) the lighting leaves a lot to be desired. John. The information transmitted is intended only for the person to whom it is addressed and may contain confidential and/or privileged material. If you have received an email in error please notify Carmel College on [EMAIL PROTECTED] then delete all copies of it from your systems. Although Carmel College scans incoming and outgoing emails and email attachments for viruses we cannot guarantee a communication to be free of all viruses nor accept any responsibility for viruses. Although Carmel College monitors incoming and outgoing emails for inappropriate content, the college cannot be held responsible for the views or expressions of the author. The views expressed may not necessarily be those of Carmel College and Carmel College cannot be held responsible for any loss or injury resulting from the contents of a message. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
On 8/11/07, John Whittingham [EMAIL PROTECTED] wrote: On Fri, 10 Aug 2007 08:54:54 -0700, Godfrey DiGiorgi wrote I bought a WhiBal card because there are times when it would be useful to have a reliable white/gray/black reference in a test frame when I'm doing post processing. I never manually set a white balance in the camera, it's a waste of time unless you're using JPEG capture, and I only use RAW capture. If I need to calibrate a camera for accuracy, a gray card isn't going to be much use... G Sorry for not replying sooner, just had to reformat the PC! PITA. Thanks for the advice and recommendations everyone, I may try and locate a Whibal card over here in the UK. No paper towels in the UK,:-) Dave Regards, John The information transmitted is intended only for the person to whom it is addressed and may contain confidential and/or privileged material. If you have received an email in error please notify Carmel College on [EMAIL PROTECTED] then delete all copies of it from your systems. Although Carmel College scans incoming and outgoing emails and email attachments for viruses we cannot guarantee a communication to be free of all viruses nor accept any responsibility for viruses. Although Carmel College monitors incoming and outgoing emails for inappropriate content, the college cannot be held responsible for the views or expressions of the author. The views expressed may not necessarily be those of Carmel College and Carmel College cannot be held responsible for any loss or injury resulting from the contents of a message. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net -- Equine Photography www.caughtinmotion.com http://brooksinthecountry.blogspot.com/ Ontario Canada -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
On 8/10/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Accuracy is for the unimaginative:-)). I'll remember that next time someone says I missed the focus. Cheers, Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
[EMAIL PROTECTED] wrote: Accuracy is for the unimaginative Good one! Godfrey -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
I bought a WhiBal card because there are times when it would be useful to have a reliable white/gray/black reference in a test frame when I'm doing post processing. I never manually set a white balance in the camera, it's a waste of time unless you're using JPEG capture, and I only use RAW capture. If I need to calibrate a camera for accuracy, a gray card isn't going to be much use... G -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
On 8/10/07, William Robb [EMAIL PROTECTED] wrote: - Original Message - From: Mark Roberts Subject: Re: Recommendations for digital grey card I'll remember that next time someone says I missed the focus. You miss the focus sometimes??? I miss my hair sometimes. Look in a mirror, that should help.:-) Dave ww -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net -- Equine Photography www.caughtinmotion.com http://brooksinthecountry.blogspot.com/ Ontario Canada -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
On 8/11/07, William Robb [EMAIL PROTECTED] wrote: - Original Message - From: Mark Roberts Subject: Re: Recommendations for digital grey card I'll remember that next time someone says I missed the focus. You miss the focus sometimes??? I miss my hair sometimes. ww ...when your trying to comb it? Cheers, Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
I found that with the DS body that the metering calibration for RAW format capture was off by between .3-.7 EV, no matter what the lighting. In bright circumstances, and low ISO settings, I nearly always needed to add .3EV ... at ISO 400-800 and low light, tungsten illumination, I needed to set .7EV. The K10D does much better in this regard, I'm much more of the time at 0 to +.3EV. White balance should be of no consequence, although it's possible that changing the white balance somehow affects the metering calibration ... dunno. Although it is true that imaging and metering sensors are more sensitive to light in the red/IR range than in the green/blue range, and incandescent light is shifted way into the red range, so maybe the adjustment to WB could affect it in that way somehow... Godfrey On Aug 10, 2007, at 9:12 AM, Igor Roshchin wrote: There is one type of lighting where I found it useful to set the WB manually, while shooting RAW. While shooting in low ncandescent light, if I use the auto white balance, the images turn to be way underexposed when the balance is corrected. (this is on *istDS) It may be possible to do exposure compensation instead, but I haven't tried this yet. I bought a WhiBal card because there are times when it would be useful to have a reliable white/gray/black reference in a test frame when I'm doing post processing. I never manually set a white balance in the camera, it's a waste of time unless you're using JPEG capture, and I only use RAW capture. If I need to calibrate a camera for accuracy, a gray card isn't going to be much use... -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
On 8/11/07, Mark Roberts [EMAIL PROTECTED] wrote: David Savage wrote: On 8/10/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Accuracy is for the unimaginative:-)). I'll remember that next time someone says I missed the focus. You miss the focus sometimes??? Yep. For example portraits with the tip of the nose (or the ears) pin sharp. Cheers, Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
David Savage wrote: On 8/10/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Accuracy is for the unimaginative:-)). I'll remember that next time someone says I missed the focus. You miss the focus sometimes??? -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
- Original Message - From: Igor Roshchin Subject: Re: Recommendations for digital grey card The main inconvenience is that you need to do some house chores before that towel becomes gray. :-D It's only a problem if the wife is inefficient G WW -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
- Original Message - From: Mark Roberts Subject: Re: Recommendations for digital grey card I'll remember that next time someone says I missed the focus. You miss the focus sometimes??? I miss my hair sometimes. ww -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
There is one type of lighting where I found it useful to set the WB manually, while shooting RAW. While shooting in low ncandescent light, if I use the auto white balance, the images turn to be way underexposed when the balance is corrected. (this is on *istDS) It may be possible to do exposure compensation instead, but I haven't tried this yet. Igor Fri Aug 10 11:54:54 EDT 2007 Godfrey DiGiorgi wrote: I bought a WhiBal card because there are times when it would be useful to have a reliable white/gray/black reference in a test frame when I'm doing post processing. I never manually set a white balance in the camera, it's a waste of time unless you're using JPEG capture, and I only use RAW capture. If I need to calibrate a camera for accuracy, a gray card isn't going to be much use... -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
Rick Womer wrote: Mark!! --- [EMAIL PROTECTED] wrote: Accuracy is for the unimaginative:-)). Paul -- Original message I was just gonna say that and I kinda do what Paul does a lot of the time. ann Moody friends. Drama queens. Your life? Nope! - their life, your story. Play Sims Stories at Yahoo! Games. http://sims.yahoo.com/ -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
[EMAIL PROTECTED] wrote: Accuracy is for the unimaginative:-)). grin -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
On Aug 10, 2007, at 10:58 AM, [EMAIL PROTECTED] wrote: I've used white mat board as well, although only when shooting cars or something else that has to be color accurate. I generally just adjust color temperature to my personal preference. Accuracy is for the unimaginative:-)). I use these: http://warmcards.com/ I keep a set in my camera bag for still photography, and in my video camera bag for video use. They let you tune color balance pretty much any way you want so you don't have to fool with it after the fact. Bob -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
I've used white mat board as well, although only when shooting cars or something else that has to be color accurate. I generally just adjust color temperature to my personal preference. Accuracy is for the unimaginative:-)). Paul -- Original message -- From: Mark Roberts [EMAIL PROTECTED] William Robb wrote: The best tool I've found to date for setting white balance is a white paper towel. They come on rolls of a couple of hundred for a couple of dollars, and have many uses around the house. This may be an area where spending lots of money doesn't give a net gain in performance. I use white mat board. It's available in many different shades of white, so I can use a warm, neutral or cool white balance card as needed. My local art supply shops gives me scraps for free. (They don't have as many additional uses as paper towels, though.) -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
- Original Message - From: Mark Roberts Subject: Re: Recommendations for digital grey card I use white mat board. It's available in many different shades of white, so I can use a warm, neutral or cool white balance card as needed. My local art supply shops gives me scraps for free. (They don't have as many additional uses as paper towels, though.) My wife was quite annoyed with me about this. I discovered how good paper towels were at a dog show being held in a hockey arena. I was suing the istD, and needed to shoot jpegs for a variety of reasons. I needed a good WB, and was having difficulty with the cameras AWB getting it right. Someone had a roll of paper towels on their grooming table, so I grabbed one and took a reading off it, and had an very good WB as a result. Anyway, for the next year or so, I insisted that she buy different brands to see if I could get a brand that worked better. I settled on Bounty. William Robb -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
William Robb wrote: The best tool I've found to date for setting white balance is a white paper towel. They come on rolls of a couple of hundred for a couple of dollars, and have many uses around the house. This may be an area where spending lots of money doesn't give a net gain in performance. I use white mat board. It's available in many different shades of white, so I can use a warm, neutral or cool white balance card as needed. My local art supply shops gives me scraps for free. (They don't have as many additional uses as paper towels, though.) -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
- Original Message - From: John Whittingham Subject: Recommendations for digital grey card I'm looking for recommendations for a good digital grey card, mainly for setting white balance when working with RAW files. I've come across this one and would welcome opinions and recommendations: http://www.morco.uk.com/latest/grey_card.htm http://www.photo-software.com/greycard.htm BTW I'm not looking at spending a fortune 9) The best tool I've found to date for setting white balance is a white paper towel. They come on rolls of a couple of hundred for a couple of dollars, and have many uses around the house. This may be an area where spending lots of money doesn't give a net gain in performance. William Robb -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
I ordered a WhiBal card from http://www.rawworkflow.com just the other day. Godfrey On Aug 10, 2007, at 12:46 AM, John Whittingham wrote: I'm looking for recommendations for a good digital grey card, mainly for setting white balance when working with RAW files. I've come across this one and would welcome opinions and recommendations: http://www.morco.uk.com/latest/grey_card.htm http://www.photo-software.com/greycard.htm BTW I'm not looking at spending a fortune 9) -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
- Original Message - From: Godfrey DiGiorgi Subject: Re: Recommendations for digital grey card White balance should be of no consequence, although it's possible that changing the white balance somehow affects the metering calibration ... dunno. Although it is true that imaging and metering sensors are more sensitive to light in the red/IR range than in the green/blue range, and incandescent light is shifted way into the red range, so maybe the adjustment to WB could affect it in that way somehow... I've always been a little vague about precisely what white balance is doing, I've alway presumed that it is adjusting the gain of the colour receptors. If so, is it possible that the exposure variance could be generated by the voltage multiplier, not the exposure system itself? William Robb -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
It looks like I am getting a very reasonable exposure with my DS in a daylight setting. In lower (not incandescent) light it tends to be underexposed by ~0.3-0.7 EV, as you said. I wonder if this was somehow by design. I remember that they did it in Nikon D100, so that the photos were underexposed by 0.5 or 1 EV, to avoid burning the highlights. I tend to agree with you on the hypothesis how the WB is related to metering with incandescent light. Igor Fri Aug 10 13:31:45 EDT 2007 Godfrey DiGiorgi wrote: I found that with the DS body that the metering calibration for RAW format capture was off by between .3-.7 EV, no matter what the lighting. In bright circumstances, and low ISO settings, I nearly always needed to add .3EV ... at ISO 400-800 and low light, tungsten illumination, I needed to set .7EV. The K10D does much better in this regard, I'm much more of the time at 0 to +.3EV. White balance should be of no consequence, although it's possible that changing the white balance somehow affects the metering calibration ... dunno. Although it is true that imaging and metering sensors are more sensitive to light in the red/IR range than in the green/blue range, and incandescent light is shifted way into the red range, so maybe the adjustment to WB could affect it in that way somehow... -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
On Fri, Aug 10, 2007 at 11:41:01AM -0600, William Robb wrote: - Original Message - From: Godfrey DiGiorgi Subject: Re: Recommendations for digital grey card White balance should be of no consequence, although it's possible that changing the white balance somehow affects the metering calibration ... dunno. Although it is true that imaging and metering sensors are more sensitive to light in the red/IR range than in the green/blue range, and incandescent light is shifted way into the red range, so maybe the adjustment to WB could affect it in that way somehow... I've always been a little vague about precisely what white balance is doing, I've alway presumed that it is adjusting the gain of the colour receptors. If so, is it possible that the exposure variance could be generated by the voltage multiplier, not the exposure system itself? William Robb What white balance does depends on the design of the circuitry. On most digital cameras white balance has absolutely no effect on raw capture. On some sensors, though (including the one Nikon use in the D2 models, if memory serves) white balance does exactly what you surmise, affecting the gain applied to the sensors during the initial readout. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
- Original Message - From: [EMAIL PROTECTED] Subject: Re: Recommendations for digital grey card I've used white mat board as well, although only when shooting cars or something else that has to be color accurate. I generally just adjust color temperature to my personal preference. Accuracy is for the unimaginative:-)). If you have to shoot jpegs, accuracy is much more important, although less so now with the new RAW converter. I appreciate the sentiment though, if I'm shooting RAW I leave usually the WB on auto and sort it out later. Something to consider, I was waxing on to the guy who owns the studio I help out at about the accuracy of AWB, so he went out and tried some tests. What he found was that on an individual image basis, it works fine, but if one is shooting an entire wedding (for example) with AWB, then the pictures will have a slightly different white balance from set up to set up, and the album will have a disjointed look, much like if you had used several different film brands for the job. He sets his WB to 5000K, locks it in and goes from there. William Robb -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
On Aug 10, 2007, at 10:41 AM, William Robb wrote: White balance should be of no consequence, although it's possible that changing the white balance somehow affects the metering calibration ... dunno. Although it is true that imaging and metering sensors are more sensitive to light in the red/IR range than in the green/blue range, and incandescent light is shifted way into the red range, so maybe the adjustment to WB could affect it in that way somehow... I've always been a little vague about precisely what white balance is doing, I've alway presumed that it is adjusting the gain of the colour receptors. If so, is it possible that the exposure variance could be generated by the voltage multiplier, not the exposure system itself? The white balance setting isn't necessarily touching the hardware at all. In most cameras, it is an adjustment to the image processing parameters used to convert the linear gamma, bayer-matrix RAW sensor data to an RGB channeled, gamma corrected representation. In some cameras, it *might* touch the data in the pre-RAW processing that happens between the sensor and the A-D converter, but I have seen no evidence that this is the case in the *ist DS body, and little to indicate that it in the K10D body either. The main linkage between white balance and exposure is likely in a connection between the camera's exposure control software and those image processing software parameters. The DS body's metering calibration was definitely tuned to produce good results for the standard default settings on the Auto Picture mode ... bright color setting, JPEG capture, etc. Changing to RAW capture, the metering calibration does not change even though the exposure requirements of a RAW capture are quite different due to the wider dynamic range and gamut possible. Setting the White Balance in RAW capture mode affects the JPEG preview and thumbnail, the histogram and saturation blinkies ... it might also affect the metering calibration. By Igor's experience, I'd say this last is possibly true, but I'd have to do some testing to say for sure. Godfrey -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
On Aug 10, 2007, at 11:53 AM, Igor Roshchin wrote: This makes good sense to me. If it is correct, it brings up an idea (here goes a patent, but oh, well..): camera shooting modes or options (e.g. one of the green modes, or via a separate wheel/switch) such as tungsten, low light, etc. - which in addition to changing the WB also enable a different metering calibration. I've long been an advocate that camera manufacturers should include the capability for user settable metering calibration defaults, and of course easy recovery to the factory calibrated default settings. It would save me having to remember on each camera which tweak of the settings I need on average, and make a useful gain in adjustment range if I didn't have to compensate for my personal default compensation. Godfrey -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Recommendations for digital grey card
I'm looking for recommendations for a good digital grey card, mainly for setting white balance when working with RAW files. I've come across this one and would welcome opinions and recommendations: http://www.morco.uk.com/latest/grey_card.htm http://www.photo-software.com/greycard.htm BTW I'm not looking at spending a fortune 9) John The information transmitted is intended only for the person to whom it is addressed and may contain confidential and/or privileged material. If you have received an email in error please notify Carmel College on [EMAIL PROTECTED] then delete all copies of it from your systems. Although Carmel College scans incoming and outgoing emails and email attachments for viruses we cannot guarantee a communication to be free of all viruses nor accept any responsibility for viruses. Although Carmel College monitors incoming and outgoing emails for inappropriate content, the college cannot be held responsible for the views or expressions of the author. The views expressed may not necessarily be those of Carmel College and Carmel College cannot be held responsible for any loss or injury resulting from the contents of a message. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
Fri Aug 10 10:09:37 EDT 2007 William Robb wrote: - Original Message - From: John Whittingham Subject: Recommendations for digital grey card I'm looking for recommendations for a good digital grey card, mainly for setting white balance when working with RAW files. I've come across this one and would welcome opinions and recommendations: http://www.morco.uk.com/latest/grey_card.htm http://www.photo-software.com/greycard.htm BTW I'm not looking at spending a fortune 9) The best tool I've found to date for setting white balance is a white paper towel. They come on rolls of a couple of hundred for a couple of dollars, and have many uses around the house. This may be an area where spending lots of money doesn't give a net gain in performance. The main inconvenience is that you need to do some house chores before that towel becomes gray. :-D Igor -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
Mark!! --- [EMAIL PROTECTED] wrote: Accuracy is for the unimaginative:-)). Paul -- Original message Moody friends. Drama queens. Your life? Nope! - their life, your story. Play Sims Stories at Yahoo! Games. http://sims.yahoo.com/ -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Recommendations for digital grey card
Fri Aug 10 14:25:30 EDT 2007 Godfrey DiGiorgi wrote: On Aug 10, 2007, at 10:41 AM, William Robb wrote: White balance should be of no consequence, although it's possible that changing the white balance somehow affects the metering calibration ... dunno. Although it is true that imaging and metering sensors are more sensitive to light in the red/IR range than in the green/blue range, and incandescent light is shifted way into the red range, so maybe the adjustment to WB could affect it in that way somehow... I've always been a little vague about precisely what white balance is doing, I've alway presumed that it is adjusting the gain of the colour receptors. If so, is it possible that the exposure variance could be generated by the voltage multiplier, not the exposure system itself? The white balance setting isn't necessarily touching the hardware at all. In most cameras, it is an adjustment to the image processing parameters used to convert the linear gamma, bayer-matrix RAW sensor data to an RGB channeled, gamma corrected representation. In some cameras, it *might* touch the data in the pre-RAW processing that happens between the sensor and the A-D converter, but I have seen no evidence that this is the case in the *ist DS body, and little to indicate that it in the K10D body either. The main linkage between white balance and exposure is likely in a connection between the camera's exposure control software and those image processing software parameters. The DS body's metering calibration was definitely tuned to produce good results for the standard default settings on the Auto Picture mode ... bright color setting, JPEG capture, etc. Changing to RAW capture, the metering calibration does not change even though the exposure requirements of a RAW capture are quite different due to the wider dynamic range and gamut possible. Setting the White Balance in RAW capture mode affects the JPEG preview and thumbnail, the histogram and saturation blinkies ... it might also affect the metering calibration. By Igor's experience, I'd say this last is possibly true, but I'd have to do some testing to say for sure. This makes good sense to me. If it is correct, it brings up an idea (here goes a patent, but oh, well..): camera shooting modes or options (e.g. one of the green modes, or via a separate wheel/switch) such as tungsten, low light, etc. - which in addition to changing the WB also enable a different metering calibration. Igor -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
