MagickWand for PHP is an object-oriented PHP interface to ImageMagick. Use this forum to discuss, make suggestions about, or report bugs concerning MagickWand for PHP.
Reading Anthony's ImageMagick Examples here: http://www.imagemagick.org/Usage/color/#levels
While adjusting the black and white 'points' inward will increase the overall contrast of the image, a little...
convert rose: -level 5%,95%,1.0 rose_contrast.gif
Or increase the contrast a LOT...
convert rose: -level 20%,80%,1.0 rose_contrast2.gif
How to implement this in MagickWand PHP? I know there's a function MagickLevelImage, but it seems I cannot use percentage in the function's parameters.
- Posts: 22
- Joined: 2008-01-04T18:26:40-07:00
Yep I can't get this to work either... The image is always white. Could you be a bit more specific in what parameters it accepts please?
- Posts: 1015
- Joined: 2005-03-21T21:16:57-07:00
The IM source code implies that the inputs are within the quantum range, so if you wanted to pass arguments equivalent to "-level 5%,95%,1.0", In C you would use (I presume PHP is similar):
Code: Select all
Note that the arguments are black_point, gamma, white_point
Sorry, my ISP shutdown all personal webspace so my MagickWand Examples in C
See my message in this topic
for a link to a zip of all the files.