03-02-2011, 10:07 AM
Is it possible that underexposed shot + exposure slide in ACR vs. high ISO setting usage can have same consequences in resulting image? I really ask this because I'd like to enhance my knowledge in that respect. Firstly, I think it highly depends on how dark is the capture RAW image (which is to be corrected in ACR for example). I fully agree that the sensors don't have changing sensitivity but the amplification of the signal does the job if the ISO is increased. But is is the same when it comes to manipulate the raw data in ACR?
If you underexpose by using higher shutter speeds at -lets say- base ISO, you'll get less light photons hitting the sensor, and apart from brightness issues you'll have limited saturation, tonal and dynamic range. OTOH, if you shoot at appropriate shutter speeds at higher ISO setting, -depending on the high ISO performance of the camera- you'll have color/luminance noise, limited sharpness, and comparatively more tonal and dynamic range (if the captured image at the first case was very dark). So, latter has sharpness and noise problems in addition, but comparatively better in terms of tonal/dynamic range. Isn't that right or am I missing something?
Serkan
If you underexpose by using higher shutter speeds at -lets say- base ISO, you'll get less light photons hitting the sensor, and apart from brightness issues you'll have limited saturation, tonal and dynamic range. OTOH, if you shoot at appropriate shutter speeds at higher ISO setting, -depending on the high ISO performance of the camera- you'll have color/luminance noise, limited sharpness, and comparatively more tonal and dynamic range (if the captured image at the first case was very dark). So, latter has sharpness and noise problems in addition, but comparatively better in terms of tonal/dynamic range. Isn't that right or am I missing something?
Serkan