Really what I'm trying to do is rotate the canvas without rotating the image.  I do this in my other software, but trying to do it in gimp.

I want to take a horizontal image, rotate the canvas to vertical and then enlarge the original horizontal image to fit the vertical canvas.

I've tried for an hour to figure out how....not so far.

It's easy enough to resize the canvas to vertical format, but then I can't make the image by itself bigger to fit the canvas.

Any help is appreciated.

This may be more of a question for a 3D CAD or some other sort of 3D forum, but I’m coming at it from the photo side of things. Likely someone has had a similar question.


I’d  like to use two flat 2d images, both with a common background in a composite image.  Both pictures are taken pointing the same direction.  One is just taken a good distance behind where the other one is from.


I can adjust the scale of the rear picture so the common distant objects are the same height. However, objects in foreground, close to the position of the camera are not the right height when compared to objects at that distance in the photo taken second picture a distance behind the first.


I saw that GIMP has a 3D perspective transform too, but it looks like it would not really be of any use for what I’m thinking.


I suppose maybe using a different lens for the two pictures is an option.


It also seems like this may be possible with software. I only use GIMP a little. I’ve used some 3D applications even less, but have used Sketchup a little most recently.  


It allows you to create a rectangle then pull or push the face of it up or down to create a cubic shape. You can then adjust the size of one of the faces to create some sort of trapezoidal cubic shape, create a beveled edge or what not. 


I was thinking if you could put an image on the original rectangle and leave it on it as you pulled it up and adjusted the size, maybe you could do this. The image is a raster image and the 3D app uses vector images, but in the intitual cubic shape after the rectangle has just been pulled up each pixel in the top rectangle would line up with the same pixel in the bottom rectangle and the could be connected with a straight line.  So any adjustments later, those lines would still be there. At this point the location of each pixel on the initial rectangle surface is known and now connected by lines there is the makings to create 3D geometry and relationships to create a 3D vector image.


So the ultimate image adjusted for perspective would be composed of pixels from a series of slices and where they fit on the surface of each slice. So if you adjusted the top layer so it is smaller, the middle would be the top slice, each outer slice would be the pixels on the lines that are outside the the boundaries of the top slice.


This is sort of how 3D printing is done, although using vector graphics all along.  I also remember where they took some donated human cadavers which I guess they may have added some dies to indicated blood vessels and other structures and frozen and sliced them into very thin slices and took a picture or created a digital image of each slice.  Then reassembled all the digital slices to create a 3D image of the bodies.


I probably don’t quite have it right how it all works, but it looks like something along these lines is already being done for other things.  Anyone know if there is an app or an easy way to do this?

I am trying to repair an old B&W document.
It is in a really bad shape. Could you give me some ideas.

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Hello,

I am relatively new to GIMP. I've done a search for the plugin to descreen pictures the plugin registry has been discontinued.
I've also searched this forum (Extending the Gimp) without result.

In its absence, how do I go about descreening images effectively in Gimp?

Using Win10 64bit
Gimp 2.10.22

Hello everyone. I have this simple normal image. What i want to do is to edit alpha channel as a curve, but based on Red and Green channel. RGB channels must remain unchanged ("colour to alpha" change them). I know Colours - Levels/Curve tools, thats ability i want, but i haven't find out how to use input channel different from output channel. So i can edit for example Red in different shades of Red, but not based on Green. 
 I really need it similar to curve, in my example image there is only few shades, but i want to learn proper workflow for complex images too.

I'm using GIMP 2.10. I'm total gimp newbie, i use it only for simple edits of my textures.. So please detailed answer is appreciated.

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Hiya. I've been using Gimp since wayyyyy back (I forgot the version). "Back in the day", a whole slew of canned logo's, bullets etc. were included with the installation (Chrome, Basic I/II, Starburst, Frosty, Alien Glow, etc.) Are these available anymore?

They were found at: File/Create/Logos...

Thanks, Dana

I made a plugin to crop a path, similar to cropping an image or a layer. I don't know any such tool in Gimp previously, but what I know about Gimp is very limited, so please enlighten me if I am wrong.

Actually I made four plugins, two for cropping, two for slicing:

1. Crop path by convex polygon
   
2. Crop path by rectangle
   
3. Slice path by guides
   
4. Slice path by lines
   

1. a rectangular selection
   
2. four guides (two horizontal, two vertical)
   
3. image (canvas)
   
4. the active layer.
   

Hi!
Created simple business card. Some text boxes, one image. Saved. 
Now opened it and if I click on Text tool and then on text, it changes size. Cannot figure out how to edit text without damaging it's size. In layers it show as A - I guess as text layer. Right click on layer and Edit on canvas gives the same result.

I downloaded and ionstalled the latest Gimp 2.10.22 in windows 64.
However now I find all my scripts -Fu and python plug in are greyed out.
How do I restore all these scripts and plugins

I am sorry I found out that this was because I had not opened any imgae in Gimp. Once I opened an image everything was OK.

If I'm using a brush to erase/remove fragments/particles of an image, how can I get 100% removal of everything the brush touches? I don't want any "grey" transition fading left. I want to use a "splatter" brush to remove particles...completely.