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Correcting Photographs of Paintings with Gimp
I'm a new Gimp users (2.2 on a PC) who's very impressed with the
program. Most of what I'm used to doing in Paintshop Pro (PSP) I find I can do in Gimp very well. I have one awkwardness that I hope someone can help me with. I take photos of my wife's paintings quite regularly and need to correct for perspective distortion because I don't get the camera exactly centered on the painting. In PSP there's a very hand perspective tool that allows one to identify four corners of an object - a rectangle originally, but a distorted trapezoid in the image. Activating the tool makes the object a rectangle which I can then crop to get a clean image. Is there a way of doing the same thing relatively easily in Gimp? I know that I can use the path tool to create the boundaries of my object and then can transform it visually to a rectangle (using guides), but I'd love to have something easier than that, that makes the edges exactly horizontal and vertical. Thanks |
#2
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Correcting Photographs of Paintings with Gimp
Apologies folks - I thought I was posting to a different group.
Please ignore. On Aug 18, 8:37 pm, AEngineer wrote: I'm a new Gimp users (2.2 on a PC) who's very impressed with the program. Most of what I'm used to doing in Paintshop Pro (PSP) I find I can do in Gimp very well. I have one awkwardness that I hope someone can help me with. I take photos of my wife's paintings quite regularly and need to correct for perspective distortion because I don't get the camera exactly centered on the painting. In PSP there's a very hand perspective tool that allows one to identify four corners of an object - a rectangle originally, but a distorted trapezoid in the image. Activating the tool makes the object a rectangle which I can then crop to get a clean image. Is there a way of doing the same thing relatively easily in Gimp? I know that I can use the path tool to create the boundaries of my object and then can transform it visually to a rectangle (using guides), but I'd love to have something easier than that, that makes the edges exactly horizontal and vertical. Thanks |
#3
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Correcting Photographs of Paintings with Gimp
"AEngineer" wrote
On Aug 18, 8:37 pm, AEngineer wrote: [Photos of artwork] Is there a way of [correcting perspective] in Gimp? Apologies folks - I thought I was posting to a different group. Please ignore. Well, if you used a large format camera then getting the camera parallel to the artwork is a lot easier and you wouldn't have to use Gimp[??]. "gimp [ ?][Colloq.] 1. lame ..." I take it Gnu doesn't have a marketing department? * * * Even with a P&S it isn't that hard to get the camera and A/W parallel. Camera on a tripod, a/w on the wall, a knotted string and 9th grade geometry will solve the problem After it is all figured out then put spike marks on the floor (a bit of sticky tape is usual) for the tripod legs, mark the wall with a cross with centering marks or locations to attach a marked card/sheet/board, and make up a string and bob for setting the camera height. This is the way copy photos were made in photo studios for over a century. -- Nicholas O. Lindan, Cleveland, Ohio Darkroom Automation: F-Stop Timers, Enlarging Meters http://www.darkroomautomation.com/index.htm n o lindan at ix dot netcom dot com |
#4
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Correcting Photographs of Paintings with Gimp
Nicholas O. Lindan wrote:
"AEngineer" wrote On Aug 18, 8:37 pm, AEngineer wrote: [Photos of artwork] Is there a way of [correcting perspective] in Gimp? Apologies folks - I thought I was posting to a different group. Please ignore. Well, if you used a large format camera then getting the camera parallel to the artwork is a lot easier and you wouldn't have to use Gimp[??]. "gimp [ ?][Colloq.] 1. lame ..." I take it Gnu doesn't have a marketing department? * * * No, but the pricing is fairly attractive. BTW, if AEngineer does get an answer to his question, I hope he'll drop by and share it. |
#5
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Correcting Photographs of Paintings with Gimp
Nicholas O. Lindan wrote:
Well, if you used a large format camera then getting the camera parallel to the artwork is a lot easier and you wouldn't have to use Gimp[??]. (. . .) Even with a P&S it isn't that hard to get the camera and A/W parallel. Camera on a tripod, a/w on the wall, a knotted string and 9th grade geometry will solve the problem (. . .) This is the way copy photos were made in photo studios for over a century. Bravo for giving the guy a large-format-camera (or any camera) solution instead of berating him for posting to the wrong group or even just ignoring him! |
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