Creating profile from target
Posted: Sun Nov 30, 2003 12:36 am
To create noise profiles for my Minolta 7Hi I did:
1. Printed and fotographed the Target chart at ISO 100, 200, 400 and 800. For each ISO I shot in aperture priority at all apertures, 3.5, 4, 4.5, 5.6, 6.7, 8 and 9.5 - a total of 28 shots!
2. Analised the charts doing a rough analysis on the center square, then did a fine tune analysis on each small square ( 17 squares total ) for each aperture at ISO 800. ( each chart takes me around 15 minutes in my PC Athlon 1.3 MHz, 512 MB RAM ).
3. After doing all that for ISO 800, I decided to test the profiles on a photo I took at ISO 800 and although the result was excellent, I was surprised to see that it did not matter which aperture profile I used th result was the same!!
Obviously I only then analysed one aperture chart ( chose 5.6 ) for each other ISO !!
I went through all that explanation to make sure other usera don't make the same wrong assumption I did thinking Aperture would be impotrtant.
I guess the NI User's Manual shoud be more complete when explaining how to make calibration profiles which may have avoided me going through all that exercise!!
I'm wondering now if it's worth making profiles for each ISO at each shutter speed .... !!!! Anybody knows ??
1. Printed and fotographed the Target chart at ISO 100, 200, 400 and 800. For each ISO I shot in aperture priority at all apertures, 3.5, 4, 4.5, 5.6, 6.7, 8 and 9.5 - a total of 28 shots!
2. Analised the charts doing a rough analysis on the center square, then did a fine tune analysis on each small square ( 17 squares total ) for each aperture at ISO 800. ( each chart takes me around 15 minutes in my PC Athlon 1.3 MHz, 512 MB RAM ).
3. After doing all that for ISO 800, I decided to test the profiles on a photo I took at ISO 800 and although the result was excellent, I was surprised to see that it did not matter which aperture profile I used th result was the same!!
Obviously I only then analysed one aperture chart ( chose 5.6 ) for each other ISO !!
I went through all that explanation to make sure other usera don't make the same wrong assumption I did thinking Aperture would be impotrtant.
I guess the NI User's Manual shoud be more complete when explaining how to make calibration profiles which may have avoided me going through all that exercise!!
I'm wondering now if it's worth making profiles for each ISO at each shutter speed .... !!!! Anybody knows ??