> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Craig Zendel > Sent: Thursday, June 26, 2003 4:30 AM > To: [EMAIL PROTECTED] > Subject: EOS Auto contrast? > > > Hi all, > > I wonder if any consideration has been given to incorporating an "auto > contrast" setting for dslrs. > > The evaluative metering is smart enough to recognise a high/low contrast > situation and the metering algorithms are already linked to the contrast > setting (10D). > > Useful? > > CraigZ > >
Hi CraigZ, IMO it's doubtful that the EOS metering system is sophisticated enough to successfully recognize and fully consider contrast in exposure. Maybe the Nikon meter could go it as they have so many data points available and even color data! I also don't think that there is enough resolution in the EOS metering system to effectively do this except in the most vague sort of way. Between the lack of speed and resolution the metering system is a weak way to accomplish this. BUT if this data were available I'd imagine the EOS metering system could be programmed to fully consider contrast range in the compromise that makes up exposure values based on the camera mode and settings (photographer's intent). One obvious way to get this done would be to incorporate a small full frame, low res. secondary CCD sensor without any AA filters in front of it to simply collect scene luminance as seen through the lens. Alternately in place of the current metering sensor you could simply replace it with a small color sensor and have both color and luminance data available to the metering system. Then the meter would have the ability to capture both brightness range and color information for better white balance setting. The data could be used to aid the metering system making it aware of the contrast range of the scene and white balance and added to the data normally stored with a RAW file. The RAW conversion program would then have a good idea of the level of illumination and white balance data at the time of exposure and compare the exposure settings to see what the photographer's intent was (through the camera mode settings), or could simply be used to automatically set the white/black and white balance points during RAW conversion, great for batching. Cheers/Chip * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
