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Sepia effect with imagick like in photoshop
Posted: 2014-09-06T01:39:14-07:00
by bseeleib
I'm converting a image from color to sepia with imagick+php, using the sepiaToneImage function. While the effect is good i would like it be more like the photoshop sepia filter (pictured below). Is this possible and how? I've already tried modulateImage but i couldn't get nere the photoshop effect. As far as i unterstand it, imagick is converting the picture to grayscale and then applies color, ist it possible to convert to sepia without grayscale (as this might be the fix)?
Example picture:
Code: Select all
$img = new Imagick("test.jpg");
$img->setImageFormat('jpeg');
$img->sepiaToneImage(80);
header("Content-Type: image/jpeg");
echo $img;
Any help is appreciated.
Re: Sepia effect with imagick like in photoshop
Posted: 2014-09-06T10:19:18-07:00
by fmw42
The sepia colorization in PS is much different from IM. You can try changing the color with
1) duotone processing such as
http://www.imagemagick.org/Usage/color_mods/#duotone
2) -color-matrix such as
http://www.imagemagick.org/Usage/color_ ... lor-matrix
3) convert to grayscale and clut such as
http://www.imagemagick.org/Usage/color_mods/#clut
4) convert to graylevel and +level-colors such as
http://www.imagemagick.org/Usage/color_ ... vel-colors
But to reproduce PS exactly, the best way is to create a HALD image, take it to PS, apply the PS sepia process, then take the processed HALD image back to IM and use -hald-clut. See
http://www.imagemagick.org/Usage/color_mods/#hald-clut
Re: Sepia effect with imagick like in photoshop
Posted: 2014-09-13T15:48:27-07:00
by bseeleib
The HALD image did the trick, @fmw42 thank you very much!!!