adapting saturation

[cedricb]

I've updated IM to the latest release (6.6.1-10)

I've been able to go to step 6 from the original tutorial:

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convert girl.png -modulate 100,0,100 step2.tiff
composite step2.tiff girl.png -compose difference step3.tiff
composite step3.tiff girl.png -compose multiply step5.tiff

composite step5.tiff \( girl.png -negate \) -compose CopyOpacity mask.tiff
composite mask.tiff girl.png final.tiff

In step 7, I've tried to replicate the Auto Tone (Shift+Ctrl+L) from Photoshop: http://help.adobe.com/en_US/photoshop/c ... 764ca.html

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convert step5.tiff -auto-level step7.tiff

Obviously I'm not getting the same result...


In step 8, I can't get the same output with 30% of saturation

Code: Select all

convert step7.tiff -modulate 100,130,100 step8.tiff

[fmw42]

you might try using HSB rather than HSL with -modulate

see http://www.imagemagick.org/Usage/color/ ... colorspace

but who knows exactly what PS is doing?

[cedricb]

I've finally found the solution with the little help of the http://meetthegimp.org/ community (to get a better understanding of the layer/mask)

http://cbompart.wordpress.com/2010/06/0 ... agemagick/