[nSLUG] Gimp help? (Re: Image utility for Linux?)
tyler.smith at mail.mcgill.ca
Wed May 16 01:22:20 ADT 2007
On Tue, May 15, 2007 at 11:40:28PM -0300, Mike Spencer wrote:
> So I need help with Gimp. Other stitching options weren't adequate
> (some details below if anyone is interested) so I'm reduced to doing
> it manually, one image at a time, with Gimp.
> + Open image A in a Gimp window
> + Open image B (same height but narrower, overlaps A) in another
> Gimp window
You could open image B as a layer in the image A window, which saves
you having to cut and paste it.
> This appears to work perfectly. Now I need to make these two layers
> become all one image and save it.
> But I can't figure out how to do that.
> - The "Display navigation" window shows exactly what I want but the
> main, A window shows a checker board where the overlaid B image
> is larger than the original A image.
The checkerboard is just the Gimps way of saying there's nothing there.
> - The "Image->Merge visible layers" and "Image->Flatten image"
> options are grayed out.
I don't know why this should be... on my experiments they are operable.
> - Saving the A image as a PGM brings up an offer to "export" the
> image so as to merge the layers. The saved result has white
> where it's larger than the original A image.
I don't think you can avoid this, as PGM apparently doesn't support
transparency. Something has to be there to fill out the image. If
white is unacceptable, perhaps you could add a black background
layer? Or alternatively you could use a format that does support
transparency, like png?
I'm having my own issues with the Gimp, so my advice may not be worth
> - Other twiddles too numerous to list haven't helped.
> RT the huge, F html M? Well, I've read part of it. I'm still
> groveling around in it but haven't found an answer, other than that I
> should use the "Image->Flatten..." option which is unavailable --
> grayed out.
> Surely this is a commonplace move. Any suggestions? WHat am I
> pnmstitch, both the version in NetPBM and the one on SourceForge,
> doesn't work. At least for my images, it only produces a mess.
> My homebrew hack in C works better than pnmstitch but not well
> enough -- accurate to +/- 2 pixels in 1 image out of 20, else 10
> to 20 pixels off.
> Other apps appear to be huge packages designed to deal with the
> arcana of color and contrast balance, lens distortion,
> perspective, parallax, special problems in medical imaging
> etc. etc., all way more complicated than my humble grayscale
> scans. Since downloads in the 10s of megabyte are difficult for
> me, I've so far avoided them.
> Any pointers welcome, tnx,
> - Mike
> Michael Spencer Nova Scotia, Canada .~.
> mspencer at tallships.ca /( )\
> http://home.tallships.ca/mspencer/ ^^-^^
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