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From: Dave on 31 May 2010 02:09
Hello,

I have two images of the same type(PNG).I need to make them same interms of their gamma values and the characteristics I mentioned below.

I used imfinfo() function two see their details.

Say, my two images are img1 and img2.Both img1 and img2 are differed in the following properties.
=>img1

RenderingIntent: 'perceptual'
Chromaticities: [1x8 double]
Gamma: 0.4545
=>img2

RenderingIntent: []
Chromaticities: []
Gamma: []

I mentioned only the characteristics I want to change.

My intention is to change the img1's above characteristics equal to that of img2(to make all 3 characteristics of img1 as zero).
I tried J = imadjust(I,[low_in; high_in],[low_out; high_out],gamma) function.But I didn't get the desired result.May be I didn't the understand the function quite well.

Could any one help me to make img1's RenderingIntent,Chromaticities,Gamma values null or equal to img2's values.

regards,
Dave
From: ImageAnalyst on 31 May 2010 08:43
Dave:
Mark Grundland's histogram matching method is the best I've seen:

"Mark Grundland & Neil Dodgson, Color Histogram Specification by
Histogram Warping"
http://www.cl.cam.ac.uk/~mg290/Portfolio/ColorHistogramWarp.html

Hopefully the link works again - it wasn't working just now.
But it should do exactly what you want.
Good luck,
ImageAnalyst

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