Greetings, I am a reletive newcomer to GIMP. I have searched the Manual and the plugin registry to see if anything like this has already been done, but without success. So I'm asking if anyone out there can help or point me in the right direction.
The PROJECT ============ I am in the process of archiving my collection of 300 or so vinyl records. This includes recording them digitally, filtering out clicks, rumble, etc. and burning to CD. I am also scanning the covers, labels and inserts and burning them on a second session of the CD. And so the whole record and packaging is preserved for posterity. The PROBLEM ============ The average album cover is over 12 inches square while my (average) scanner can only handel about 8.5 x 11. So each side must be scanned as four separate quadrants and then be merged back into one image. I have been using GIMP to reassemble the images with excellent results. The problem is that it is taking me several days to complete each images. Do the math, and it will take me several years to complete this. I'm sure the process could be made faster with a little help from the experts :-). The ISSUES =========== Why does it take so long just to load two images, move layer and flatten? Well... -) The layers must line up pixel-perfect. Album covers were printed with the same technology which prints pictures in the newspaper using different sized dots of color to create a grayscale. If these tiny dots don't line up perfectly then you get an interferience pattern visable from across the room. -) After 30-40 years, the album covers are no longer square. So the one image is usually rotated slightly from the other and must be corrected. It takes me 2-3 tries to get this right. -) Since the scanner performs a new gamma correction on each scan, one image is usually lighter than the other and must be brightness/contrast corrected. It can take a few tries to get this right. -) Publishers tended to cram the backs of album covers with very fine text. This means a resolution of 600ppi to adaquately reproduce. At that resolution the images are quite large and it can take two minutes for each of the steps above to be performed. And reset. And tried again. Point is, everything happens real slow. Nothing happens in real-time. The ULTIMATE SOLUTION ====================== I would like to start with a GIMP file containing a background and a second layer. I would like to identify eight pixels within this file: 1) A pixel from the top/left of the background 2) That same pixel from the top/left of the layer 3) A pixel from the bottom/right of the background 4) That same pixel from the bottom/right of the layer 5) A light pixel from the background 6) That same light pixel from the layer 7) A dark pixel from the background 8) That same dark pixel from the layer I would then like to feed those eight pixel coordinates into a Script-Fu which would then automaticly perform the translation, rotation, contrast and brightness corrections. I could then give eyeball approval, flatten and save. HELP ===== That all being said, what do I need? 1) Has any of this been done already? For example, does anyone know of a Script-Fu which does the translation/rotation bit and I would only have to add the contrast calculations to it. It's always easier to edit than to create :-). 2) How do you get the RGB value of the pixel the cursor is pointing at? I assume it is possible... 3) Given the last four pixels listed above, just what are the equations used to calculate the brightness/contrast adjustments needed to equalise? Thanks in advance for all your help. Bob Washburne _______________________________________________ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
