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Some Functionality Queries

Jul 4, 2012, 15:07
Post: #1
Some Functionality Queries
I've been using GIMP for a while for basic website stuff. Very basic website stuff. I've recently been asked if GIMP has some more advanced features. Well, advanced put to my usual level of use anyway.

So, I thought I'd query if anyone knew if I could do the following in GIMP...

(1) Edit a BMP but ensure the file size remains the same?

The person asking is using the images for a specific purpose and they always have to be the same size.

(2) Open .pspimages and possibly save back as this format.

The answer to this seems to be no on the opening front anyway.

(3) Restrict the image to a very limited range of colours, say 3-6?

Again this is due to the very specific and restricted nature of the images they are creating.

I shall continuing my investigations, but if anyone has any ideas please don't hesitate to reply.
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Jul 4, 2012, 15:17
Post: #2
RE: Some Functionality Queries
I have been investigating establishing my own palettes, which is related to (3). Not figured out if I can restrict the editing of an image to only ever use those colours in the palette.

Still investigating.
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Jul 5, 2012, 09:01
Post: #3
RE: Some Functionality Queries
1. It depends.
For any image with the same pixel dimensions
In RGB (24 bit) mode the file size will be the same regardless of the image.
In grayscale mode the file size is different but is the same regardless of the image.
In indexed mode the filesize is different again and can vary depending on the number of colours.
The grayscale and indexed can be further screwed if compression (rle) is applied.

Bottom line, stick with whichever format (mode) is specified.

2. Used to like PSP when it was owned by Jasc, Corel is just another nasty.
I do know that some PSP images can be opened and saved to another format by XnView or IrfanView (with suitable plugins) *but* only the top layer if they are multi-layer images and not back to .pspimage format.

3. As well as indexed mode, if starting from scratch, you can use a restricted palette in RGB mode, find a suitable one or make your own.
example http://www.imageno.com/1nqtoe7i0odgpic.html

** https://www.gimp-forum.net/ now answering questions**
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