Upload & Sell: On
Peter Figen wrote:
so if you've got a black point of 4,5,3, it will end up at 7,8,6.
I would have thought that the output slider would have simply clipped the output, so that 4,5,3 would still remain 4,5,3 whereas 1,1,1 would have been clipped to 3,3,3. Does it really simply ADD/SUBTRACT rather than CLIP ?? (You can tell I don't use the output slider much.)
Yup, ADDS & SUBTRACTS ... go figure.
I never noticed since I use info pallette probes to watch as I adjust (curves or otherwise) ... like Peter suggests
Ran a series of 0,1,2,3,4,5,33 pure swatches, levels output @ 3 ... became 3,4,5,6,7,8,35
Ran a series of 252,249,246,243,240,222 levels output @ 248 ... became 245,242,239,236,234,216
Interesting to note (but likely insignificant) that @ 240,222 it only subtracted 6, and @ 33, it only added 2 (i.e. 1 less each).
So, if your image had a black @ 8, and you THOUGHT that using the output slider would clip the data, and you wanted an output of 12, setting the output slider @ 12 would actually yield 20, instead of the 12 that you were striving for. Setting the output slider to 4 (i.e. LESS THAN than your starting point of 8) would yield the 12 that you desired, i.e. Peter Figen wrote: The Levels Output method would only work assuming your numbers are 0 and 255 for black and white.
EXCELLENT point Peter ... thanks.