Re : [Gimp-user] Re: Re: Re: Monitor for Gimp
Le 31.03.2004 22:29, John Culleton a écrit : On Wednesday 31 March 2004 01:34 pm, GSR - FR wrote: [EMAIL PROTECTED] (2004-03-31 at 2011.13 +0200): [.. destructive compression ..] I am busy window shopping on Ebay etc. If the monitor has an adjustment for color temperature is that the equivalent of adjustable gamma? Or are they different parameters? No, it is an other thing. There are 4 important parameters: - white point and black point, both are adjusted with brightness and contrast settings - colour temperature: a tungstene light has a colour temperature of about 3200K, a flash lamp gives you a colour temperature of about 5500K, sunny daylight is about 6500K. With high colour temperatures, the colour cast is blueish, with low colout temperature, it is redish. Normal office work dispaly uses color temperature as high as 9300K. For photography, 6500K is better. - gamma : this is the non linear function transfer of the brightness given by the display as a function of the pixel value. -- - Jean-Luc -- John Culleton pgp0.pgp Description: PGP signature
Re: [Gimp-user] Re: Re: Re: Monitor for Gimp
On Wednesday 31 March 2004 03:52 pm, Jean-Luc Coulon (f5ibh) wrote: Le 31.03.2004 22:29, John Culleton a écrit : On Wednesday 31 March 2004 01:34 pm, GSR - FR wrote: [EMAIL PROTECTED] (2004-03-31 at 2011.13 +0200): [.. destructive compression ..] I am busy window shopping on Ebay etc. If the monitor has an adjustment for color temperature is that the equivalent of adjustable gamma? Or are they different parameters? No, it is an other thing. There are 4 important parameters: - white point and black point, both are adjusted with brightness and contrast settings - colour temperature: a tungstene light has a colour temperature of about 3200K, a flash lamp gives you a colour temperature of about 5500K, sunny daylight is about 6500K. With high colour temperatures, the colour cast is blueish, with low colout temperature, it is redish. Normal office work dispaly uses color temperature as high as 9300K. For photography, 6500K is better. - gamma : this is the non linear function transfer of the brightness given by the display as a function of the pixel value. So how do I determine which monitors, if any can have adjustable Gamma? BTW I specified 3.0 gamma in my XF86Config file but I can spot no difference in the test files. So my current Orion monitor (17) does not seem to adjust. -- - Jean-Luc -- John Culleton -- John Culleton Able Typesetters and Indexers http://wexfordpress.com ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
Re: [Gimp-user] Re: Re: Re: Monitor for Gimp
Hi, GSR - FR [EMAIL PROTECTED] writes: Let try sorter: the question was do you consider global gamma adjustment useful at all? and the reply was yes, not only useful but a basic. Well, I sortof find it distracting to have the user interface gamma corrected. If I set a reasonable gamma value on my X server, things look washed out and pale. Is that really desirable? Sven ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
[Gimp-user] Scheme in Gimp 2.0
I have tried to use a script that I used to use in Gimp 1.2.5 called 'Aqua Pill' (available from the gug.sunsite.dk website in the script gallery). All my other scripts seem to have made the leap to Gimp 2.0, as one would expect, apart from this one. The error message reads: Error while executing (script-fu-aqua-pill-button Click Me! 50 -*-tekton-*-r-*-*-24-*-*-*-p-*-*-* '(0 0 0) '(255 0 0) 10 10 1 1 TRUE TRUE TRUE) ERROR: unbound variable (errobj gimp-channel-ops-offset) What does this mean? Thanks Tom ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
Re: [Gimp-user] Scheme in Gimp 2.0
Tom Cole ([EMAIL PROTECTED]) wrote: I have tried to use a script that I used to use in Gimp 1.2.5 called 'Aqua Pill' (available from the gug.sunsite.dk website in the script gallery). All my other scripts seem to have made the leap to Gimp 2.0, as one would expect, apart from this one. The error message reads: Error while executing (script-fu-aqua-pill-button Click Me! 50 -*-tekton-*-r-*-*-24-*-*-*-p-*-*-* '(0 0 0) '(255 0 0) 10 10 1 1 TRUE TRUE TRUE) ERROR: unbound variable (errobj gimp-channel-ops-offset) What does this mean? Basically this means, that the script has to be ported to GIMP 2.0. The offending command in this error message is gimp-channel-ops-offset, which has been renamed to gimp-drawable-offset in GIMP 2.0. Looking at that error also gives the hint, that there is something wrong with the font specification, since GIMP 2.0 no longer relies on the weird -*-... X11 Logical Font Descriptor but uses Fontconfig Font specifications like Tekton 24. So someone needs to invest some amount of work into this script. Bye, Simon -- [EMAIL PROTECTED] http://www.home.unix-ag.org/simon/ ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
Re: [Gimp-user] Re: Re: Re: Monitor for Gimp
Just in case this wasn't clear in my last message, I'll expand on a few points. You can implement either or both of calibration and profiling. Having systems calibrated to a common standard means that you don't _have_ to worry about ICC profiles etc IF ALL YOU'RE DEALING WITH IS RGB DATA IN THE COLOUR SPACE REPRESENTED BY THAT CALIBRATION. Thus with the Gimp in its current form, calibration is important (it's the only thing available!). But if you want _accurate_ colour you need to implement profile support (e.g. building on top of lcms) including dynamic conversion from an image's colour space to the display system's profile. With full profile support it doesn't matter what the user's system is calibrated to (e.g. weirdarse 1.8 gamma). If an image's data is in sRGB the colours will get converted so that what is displayed on the screen is accurate, even though sRGB has a gamma of 2.2. My systems are calibrated to a gamma close to 2.2, and I can view images in ColorMatch RGB (which has a gamma of 1.8) with no problems as the profile conversion takes care of that for me.. Calibration benefits the non-colour-managed applications, but with only limited usefulness. Mac and Windows systems implement both calibration and profiling in an attempt to serve both CM and non-CM applications (and the calibration can help ensure the system is in a reasonable state prior to profiling). Full profile support is important because the colour response of your inkjet printer, scanner, printing press, etc will probably not match that of your calibrated system, and for accurate work you need a profile describing the colour space of each and to convert between them as required. I'll shut up for now. ;) Cheers __ David Burren ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
Re: [Gimp-user] Scheme in Gimp 2.0
Simon Budig wrote: The offending command in this error message is gimp-channel-ops-offset, which has been renamed to gimp-drawable-offset in GIMP 2.0. Looking at that error also gives the hint, that there is something wrong with the font specification, since GIMP 2.0 no longer relies on the weird -*-... X11 Logical Font Descriptor but uses Fontconfig Font specifications like Tekton 24. Very timely. I got perl-gimp working on my machine yesterday, and tried stampify.pl almost immediately. It failed due to the gimp_edit_fill($layer1); problem mentioned yesterday. I changed that to gimp_edit_fill($layer1, BACKGROUND_FILL); and then it failed due to the gimp_channel_ops_offset($layer1, 1, 0, -($diameter / 2), -($diameter / 2)); I changed this to gimp_drawable_offset($layer1, 1, 0, -($diameter / 2 ), -($diameter / 2 )); The script could still use a little tweaking, I think, since I can see some subtle problems I think I could fix, but it is now working. Thanks! -- Elaine Normandy (Colorado Springs) Weblog: http://www.stardel.com/fiveacres/ ___ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
