Legacy ImageMagick Discussions Archive

Hello,
see in jqmagick two effect can't replicate

Blue coloration

Vintage Heritage


anyone can post syntax fore these effect ?

thank you,
m.

It's difficult if you don't provide the original.

I think that all images can be 'converted'.
Reading about coloration here : http://www.fmwconcepts.com/imagemagick/ ... /index.php
but can't use this script i'm on Windows machine.

Is there differencies from an image to another to apply these effects ?

m.

You can (I am told) run Fred's bash script on Windows if you install Cygwin. Otherwise, you need to translate to one of Window's script languages.

Try to read fmw script but it's out of range for me.

I think to blue coloration as sort of 'sepia' effect, but now i know is not so simple.
Maybe boss let me install Cygwin on production server but i don't believe i can convince...

Any hope to have any help or hints for these effects?

Please?

coloration is really very easy. just see the bottom of my example page. it shows the commands used. but to simplify even further just do the following: convert the image to grayscale, create a 1x1 black, somecolor, white appended 1D image and stretch it out to 256x1 as a clut, then apply the lut to the grayscale image. I used HSL colors, but you can use RGB if you want.

This is just another way to tint. You could just use -tint. It is like duocolor or really tricolor, since it has white and black in the lut. See http://www.imagemagick.org/Usage/color_mods/#tinting,

See
http://www.fmwconcepts.com/imagemagick/ ... hp#rainbow.

See also colors in HSL
http://www.imagemagick.org/script/color.php


Unix:

Window (I think, though am not sure -- you may have to escape the exclamation as ^!):
Modify the hue and saturation values as desired. You can also change the grayscale image by modifying it with -sigmoidal-contrast (-brightness-contrast) or by using -grayscale xxx rather than -colorspace. Or by mixing channels using -color-matrix. See
http://www.imagemagick.org/Usage/color_mods/#clut
http://www.imagemagick.org/Usage/color_ ... lor-matrix

Thank you for reply and explanation,
find also this : Can you explain differences?

thank you, for all,
m.

convert image -set colorspace Gray -separate -average -contrast -set colorspace RGB -contrast -colorize 10,5,0 -contrast result

This command makes no sense to me and does not add much color if anything at all and -colorize needs a fill color to work. Did you try it?

I change in And obtain blue effect. I explain to myself with RGB % variation... I'm not so sure

See http://www.imagemagick.org/script/comma ... p#colorize

The default "-fill" is Black.

So you are colorizing with black, a different amount per channel. With 25,5,0 you are darkening red by most, and darkening green a little. Naturally, this makes the result bluer.