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I asked a few months ago about the difference between manually doing Levels and using the Auto Levels command because when the program does it automatically there are no holes in the histogram and whenever I did it manually I got a lot of spikes with spaces around them. At the time I was told — and it sounded convincing — that the program does it individually on each of the channels separately and then merges the result which produces a continuous histogram.
WELL … I’ve tried doing it channel-by-channel (R/G/B) manually about a dozen times now and I still get a combined RGB histogram that shows many missing levels, much as it did when I just leveled the whole image.
SO … I’m asking again: what does the program do when applying Auto Levels that results in a continuous histogram that can’t be duplicated manually? Does it intentionally spread out the levels so that there are no holes?
TIA
Norm
WELL … I’ve tried doing it channel-by-channel (R/G/B) manually about a dozen times now and I still get a combined RGB histogram that shows many missing levels, much as it did when I just leveled the whole image.
SO … I’m asking again: what does the program do when applying Auto Levels that results in a continuous histogram that can’t be duplicated manually? Does it intentionally spread out the levels so that there are no holes?
TIA
Norm
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