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  remove keystoning from painting photos
Posted by: broker12 - 07-11-2017, 01:19 PM - Forum: General questions - Replies (6)

I would like to know if GIMP has this feature . . . in photo shop, it' is called removing keystoning from photos of paintings. That's not a genuine name. It's how others talk about this feature.

What removing keystoning does is allow you to straighten up the edges off a photo of a painting. Usually, it is quite difficult to set up a painting so that the photo of it is perfectly square. In photoshop, this is the procedure for removing/straightening the edges of the photo of the painting:

Removing keystoning from a photographed rectangular work is not difficult in Photoshop. Use the Crop tool to get within a quarter inch of your painting, (but not too close). With the NAVIGATOR, ZOOM IN to at least 100%, or much more. Now SELECT/SELECT ALL. Go to EDIT/TRANSFORM/DISTORT. You will find in the corners, 4 small box buttons. Drag each of these out one at a time until you get each corner of your painting pulled tight to the corners of the image file frame. Press ENTER or RETURN (Mac), to accept these changes. Any perspective distortion present in the original image will be corrected now.

To get the proportions or aspect ratio of your painting back on track, take measurements of your original painting, go to IMAGE/IMAGE SIZE, disable the CONSTRAIN PROPORTIONS checkbox, so you can alter them. Now type into the height and width dimension boxes, the actual measurements of your painting. Since this may increase your file size to something overwhelming, you can reduce the pixels per inch to something much smaller than 300dpi to something like 96 dpi, or 72 dpi. Press OK, and your painting will be flat, square, true proportioned, and looking good! Remember to go back and reset the CONSTRAIN PROPORTIONS checkbox in IMAGE SIZE, for the next time you use that function

If anyone knows how to do this in GIMP, please let me know . . . Thanks

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  Background Certain Shapes
Posted by: motorsportfurniture - 07-11-2017, 12:51 PM - Forum: General questions - Replies (2)

Hi everyone, I'm new here but just after a bit of advice!

I would like to know how to replicate the attached image.

I have looked everywhere but with no luck, maybe i'm typing in the wrong things!

Attached Files Thumbnail(s)
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  Image color vs color picker
Posted by: YalithKBK - 07-08-2017, 11:10 AM - Forum: General questions - Replies (3)


Super n00b here. My colors are appearing very desaturated compared to how they appear in the color picker (see attached). Does anyone know why this is happening or how to fix it? Thanks!

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  New Surface Pro and Detecting Pen/Pressure Sensitivity
Posted by: aheroindisguise - 07-07-2017, 01:37 PM - Forum: Windows - Replies (2)

So I know there are many posts about using tablets and getting gimp to detect the tablet as an input device, but I'm guessing that my problem is new enough that it hasn't quite been posted about yet, or it's too scarce for me to find.

I have the new Surface Pro, i7, 1TB, windows 10, and the new Surface Pro Pen, model 1776. I am using Gimp version 2.8.22. I am not super familiar with Gimp, or with any paint program. I have dabbled with it before for very simple projects, but I struggled big time, so there is a good chance that I'm just being a newb, but I see that this issue comes up a lot on other platforms.

My pressure sensitivity works fine on Windows Ink. In gimp, by default, the pen draws exactly the same quality as the mouse does. no pressure sensitivity. I have played with the dynamic brush settings. I've copied a brush and tweaked the curves and checked different boxes. I got the velocity sensitivity to appear, although not in any sense that was useful for me. Anyway, playing with the dynamic brush settings has no affect on pressure sensitivity. I found the Edit > preferences and input devices menus. Neither the pen nor the tablet appear as a device. Just core pointer. There doesn't appear to be any interface for me to detect a new device, and resetting the devices has no effect. The Available Input Devices are DirectX Direct input, Mouse Wheel, Mouse Buttons, and Keyboard. I tried searching for drivers for the tablet or pen, but I didn't have any luck. Any advice is welcome. Thanks

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  Issue viewing GIMP-modified picture
Posted by: JuniorPear - 07-06-2017, 09:08 AM - Forum: General questions - Replies (3)

Hi everyone, 

I have a very specific issue that I haven't been able to find a solution for after googling many different things. I hope someone here can help me. 

I have an Android tablet running 4.4.2 and when I try to view an image that I have edited using GIMP, it can't be opened. I can see the thumbnail of the image in the folder, but no applications I have tried can open. They all say things like, "file is damaged" or "file corrupt" or just simply "can't open file". I have tried the standard Gallery, Google Photos, and Quickpic with no success. 

The strange thing is that it works on: an older rooted Android tablet, my computer running windows 7, an Android phone running current firmware. Again, it's only with files that I have edited using GIMP. Any other jpg file can be viewed.

Thanks in advance for any help

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  Porblem with moving tool
Posted by: Traxy - 07-05-2017, 06:01 PM - Forum: General questions - Replies (2)

hi! i just started with Gimp and never been using programs like this before
so am realy new to this...

but my project took a suden stop when i could not move my layers eny more? 
i always get this marker up every time now even if i start a new file..
witch is enoying now 


What do i have to do to get this gone....

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  How do I overlap two images?
Posted by: ferguson1951 - 07-04-2017, 08:29 AM - Forum: General questions - Replies (2)

I have this image of a bar code and I have to insert it onto the image of the back cover of a book.
How do I go about it?
Thanks and regards

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  Mask on face in a photo
Posted by: rapattack - 07-03-2017, 02:38 PM - Forum: General questions - Replies (3)

Sorry i dont know how to technically ask but i am wanting to put some type of layer or mask on the face of someone on a photo that is so they are barely seen. I dont know what that is called. I know i used something like that in some software decades ago but i have no clue of what the effect or whatever is called now or indeed then

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  Anyone using photobucket?
Posted by: Ofnuts - 07-03-2017, 12:21 PM - Forum: Watercooler - Replies (1)


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  Gimp not working after os update
Posted by: lemonphenomenon - 07-03-2017, 11:01 AM - Forum: OSX - Replies (7)

I have used Gimp, version 2.8.0, on my desktop mac, OS 10.8 (mountain lion), for several years. Yesterday I updated my operating system to 10.12.5 and now Gimp doesn't work. I get a message saying, weirdly, that Gimp cannot open Gimp-format files. My X-Quartz is version 2.7.2

Has anyone any idea what the problem might be and how to remedy it?


I have now updated XQuartz to 2.7.11, but it hasn't made any difference.

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