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07/15/2006 09:51:57 AM · #1 |
i've noticed that when viewing the histogram,wheither it be camera(s2 pro),fuji raw converter xe or photoshop cs2, there seems to be no constantacy. is it because each programme interperts the infomation differently, or is it a different reason ?.
Andy |
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07/15/2006 11:55:44 AM · #2 |
I'd guess that it's to do with the color profile used, since that's when I've most noticed inconsistincies between histograms in different programs. You might just check to make sure your programs are all using the same profile. (probably sRGB)
Are the histograms all the same general shape with just different cutoffs at the ends or do the different interpretations you get have completly different shapes? That could help determining the problem as well.
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07/15/2006 01:24:47 PM · #3 |
most of the time, it's just a case of the shadows and highlights are clipped, and slight variations of the general shape
Andy |
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07/15/2006 08:23:30 PM · #4 |
It depends on what the histogram is showing. A histogram shows a relative number of pixels at any given value (the higher the graph is at any given point, the more pixels there are of that value). There are a lot of values that can be represented by a histogram. Most cameras show Luminosity, which is how bright a pixel is. The histogram in Photoshop is a composite of the color channels (how many pixels have a Red, Blue or Green channel at that value, for example).
I believe if you have Photoshop show Luminosity in its histogram it will match what the camera is showing you.
David
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07/15/2006 08:32:45 PM · #5 |
By default, Photoshop's RAW converter makes automatic adjustments, so it's no surprise that the histogram would be different from the in-camera one. If you uncheck all the boxes for automatic adjustments, it should be close... there will still be some differences though.
The RAW converter shows you the histogram of a JPEG created using the converter settings in place at that time. The camera's histogram shows you the histogram of a JPEG created with the *in-cmarea* settings for contrast, saturation, white balance, sharpening, etcetera. These are not the same as the RAW converter settings. The Photoshop RAW converter doesn't understand the in-camera settings and cannot reproduce the output exactly. A RAW converter written by the manufacturer probably could reproduce the in-camera settings exactly. |
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