CHDK End-User's Guide - 02

[Graystar]

Lastest version in this thread...

CHDK End-User's Guide 03  - 16-MAY-08

[Psychokitty]

Great!
I will have to read through the whole thing again.
Thank you for such a perfect addition to CHDK!

[Graystar]

Update on page 42...

RGB zebra (overexp. Only) [enable / disable]
Overexposed areas are indicated by the color of the channel that is overexposed.  Underexposed are ignored.

Black – All channels are overexposed.
Red – Red channel is overexposed.
Green – Green channel is overexposed.
Blue – Blue channel is overexposed.
Cyan – Green and blue channels are overexposed.
Magenta – Red and blue channels are overexposed.
Yellow – Red and green channels are overexposed.

[PS]

RGB zebra (overexp. Only) [enable / disable]
Overexposed areas are indicated by the color of the channel that is overexposed.  Underexposed are ignored.

A610 (somehow?) indicates clipped shadows too, more less accurately (compared on PC) but only particular channel: red – red is underexposed, green – green is underexposed, blue – blue is underexposed (no C,M,Y,K).

[Graystar]

A610 (somehow?) indicates clipped shadows too, more less accurately (compared on PC) but only particular channel: red – red is underexposed, green – green is underexposed, blue – blue is underexposed (no C,M,Y,K).

Hmmm...maybe a developer can chime in and say if some cameras or some builds do things differently.

[Graystar]

Updates to explanation of histogram

RGB Histogram
RGB histograms simply count pixels at each level.  The RGB histogram of an image of three boxes (red, green, and blue) where every color has a value of 127 would be a single line in the middle of the histogram (at label “127”.)

Luminance (Y) Histogram
Luminance histograms attempt to factor in the perceived brightness of colors.  A luminance histogram of an image of three boxes (red, green, and blue) where every color has a value of 127 will show three lines at labels “38” (red- x 0.3), “75” (green x 0.59), and “14” (blue x .11).