Legacy ImageMagick Discussions Archive

Referring to previous topic on this matter I have come a bit further.

Thanks to the help of [snibgo].

I am almost there, but would like to have the final step.

What I have so far is the conversion from "Raw" to "header" version of BMP.

I now only need to find out how to insert the palette into the image.

Please see the files here.
My trials have been: .. this will create a 24 bit type "grayscale" image.
.. this will create a 4 bit type "palette" image.

I would like to create same thing as "good.bmp" which has 3 channel depths, unlike q3_palette. Also it has 256 colors.

In addition to that, I would like to modify the colors() array, which is the palette Windows sees. Either specified directly on the command line, or taken from "good.bmp".

At this moment I have to manually load each image to convert into PSP, then convert, load palette, save.

Hope I asked the question right.

Your image has only three colours. IM tries to keep the palette (and hence the number of bits used to index into the palette) small, if it can. I don't know of a way to tell IM to create a palette larger than it needs to be. However, you may be able to do it somehow. For example, this ... ... results in q4.bmp having a palette with 16 entries.

Excellent idea, the explanation makes sense to me. Although it is annoying when software tries to be "intelligent" on my behalf, just like Excel / Word tends to do. I will make some experiments with your idea there.

Do you know how to modify the individual items of the Color array ? Example modify a 16 or 256 color BMP and specifically make color 5 = #A3A3A3 ? Or specify the entire array ? Or copy a color array from somewhere ?

Thanks for your help.

IM provides tools for manipulating images, rather than the implementation of images in particular file formats. Decades ago, I wrote software to manipulate BMP files; it isn't difficult. Such software could easily change palette entries. The only difficulty would be coping with the very wide variety of BMP formats.

I expect there is software somewhere that does what you want.