What is an RGB his­togram?

It’s not just the over­all bright­ness that you can check, but the strength of the colours too

Digital Camera World - - CAMERA COLLEGE -

In ad­di­tion to a bright­ness or ‘lu­mi­nance’ his­togram, you can also view an im­age’s RGB his­togram. As the name sug­gests, this en­ables you to see sep­a­rate his­tograms for the red, green and blue pri­mary colour ‘chan­nels’ that make up the dig­i­tal pic­ture.

Be­ing able to judge the strength of each of these colours sep­a­rately is use­ful, as even when the bright­ness his­togram shows a ‘per­fect’ ex­po­sure, one of more of the colour his­tograms may be clipped. As with the bright­ness his­togram, it’s best to avoid clip­ping a colour his­togram on the right, as the colour will be over­sat­u­rated and you may lose fine de­tail in some ar­eas of the pic­ture.

The bright­ness his­togram typ­i­cally mir­rors the shape of the green his­togram, so it’s worth check­ing the RGB his­togram if the sub­ject of your photo con­tains a lot of red or blue.

Clip­ping Here, the bright­ness his­togram looks fine, but the red chan­nel is clipped.

Check the colours The bright­ness his­togram (shown at the bot­tom) fol­lows the shape of the green his­togram most closely.

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