change colors in indexed png (all files in folder)

[ohnonot]

hello everybody,

i have a large amount of small png's in a folder. i want to replace white with another color in all of them with this:

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mogrify *.png -opaque "#ffffff" -fill "#e6d6b7"

but nothing happens.

the png's are indexed and i thought it's because of that, so i tried to first change that to normal rgb (?) with different variations of

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mogrify [-format...|-define...|-type...] *.png

- and then try the first command again - but nothing changes.

please help, i've been trying and searching for hours!

ps: i copied all pics to a new folder and try to work agressively, directly overwriting the original.

[glennrp]

Try

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  mogrify -fill "#e6d6b7" -opaque "#ffffff *.png 

[ohnonot]

Try

Code: Select all

  mogrify -fill "#e6d6b7" -opaque "#ffffff *.png 

now it works!
i had tried it also with *.png in the end.
but -fill has to come before -opaque, is that it?

[glennrp]

but -fill has to come before -opaque, is that it?

Yes. "-fill" is an "image setting" and "-opaque" is an "image operator".
Settings take effect immediately where they appear on the commandline
and they persist. Operators take effect immediately using whatever settings
have appeared previously on the commandline. See
http://www.imagemagick.org/script/comma ... essing.php

[anthony]

It is done that way as it is the only way to ensure the setting you apply actually should be applied to the specific operator. If you don't have it this way you get problems when dealing with multiple operators.

The order of settings before each operator does not matter, as long as the operators are after the approparite settings, and the order of the operators is the order you want. But remember settings remain set for ALL later operators unless reset using the '+' form of the setting (no argument).

See IM Examples, Basics...
http://www.imagemagick.org/Usage/basics/

[ohnonot]

thank you both for the explanation!