Thank you for all the work on this port. Sorry for my ignorance on what is ISO, what it does, etc, I had to study it more. Try to test it correctly.
ISO override with flash testchdk menu ISO enabled // phone pic of chdk menu, if questions on menu settings
set to 1800
chdk menu custom Auto ISO // phone pic 2 ^^
min 60, max 1800, fallback 600
shooting mode = P
flash = On
AUTO ISO override value shows in osd gui as red characters, agrees w/menu.
chdkptp shoot -svm=1800 // IMG_0200.JPG
https://drive.google.com/open?id=0B1mUSgMF9DmfNGRPYlp0cTViRzAchdkptp shoot -sv=1800 // IMG_0201.JPG
https://drive.google.com/open?id=0B1mUSgMF9DmfbnFNOUhSY0p1d1kseems like autofocus lamp blinks (orange) ? Image is captured, Busy shows a short time. For each shoot cmd, 1x jpg is saved to sd card.
to my eye, -svm version looks more 'yellow' than -sv.
Nothing obvious in exifprobe's report between two images ^. EXIF IFD data does not suggest ISO override took effect, but I don't understand the photographic parameters very well..
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chdk menu ISO enabled
set to 60
chdk menu custom Auto ISO
min 60, max 1800, fallback 600
shooting mode = P
flash = On
AUTO ISO override value shows in osd gui as red characters, agrees w/menu.
chdkptp shoot -svm=60 // IMG_0202.JPG
https://drive.google.com/open?id=0B1mUSgMF9DmfUlFiSVRoLWpDSkEchdkptp shoot -sv=60 // IMG_0203.JPG
https://drive.google.com/open?id=0B1mUSgMF9DmfM1o3RXRQZ1hHVGcto my eye, there is slight diff between images but hard to describe.
I made exifprobe txt file report from each of ^ 4 images.
Nothing obvious in 'diff 200 201' between svm= and sv=.
Nothing obvious in diff between iso 1800 vs iso 60.
however, some "unknown" exif data params are different..
EXIF IFD data does not clearly show that ISO override took effect, but I don't know for sure how to tell..
In previous tests with ShortExp and LongExp, the change in exposure time was clearly seen in exif data.. For this ISO test, I do not see any of the IFD parameters changing all that much..
Did these test results give answer to what you are interested in? Please suggest any detail or parameter to try if I tested wrong.
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DNG of white surface,
I used white piece of paper as subject, with cam ~25-30cm away; flash On.
Tried to move cam close to paper so that paper filled the LCD view finder.
DNG looks 'fish-eye' and has blue color tint around perimeter..
https://drive.google.com/open?id=0B1mUSgMF9DmfU3cxWmV3T05zRFEMaybe this is not good enough? I don't have a white wall.