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Rotate ... 90 degrees then stuck ...

Jun 27, 2012, 17:42
Post: #1
Rotate ... 90 degrees then stuck ...
I have read the ROTATE section of the Manual and rotated my image (text single layer, A5 template) through 90 degrees.

No problem, but now I am left with an image with a grid over it lying at 90 degrees across the black and grey chequered background with no idea how to save this as a permanent rotated version of my original image.

Help! I have looked through all the toolbox options, and read the Layers box and looked at the options and I still don't know what to do.

I wanted to turn the image I had been working on through 90 degrees so that I could paste [?] [I can't find an "import" command] two A5 images onto an A4 template so that I could line them up and print them side-by-side.
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Jun 28, 2012, 16:39
Post: #2
RE: Rotate ... 90 degrees then stuck ...
Thank you, Ofnuts, I will work through the methods you describe and try and learn more about them.
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Jul 3, 2012, 15:30
Post: #3
RE: Rotate ... 90 degrees then stuck ...
(Jun 27, 2012 19:29)ofnuts Wrote:  
(Jun 27, 2012 17:42)Softwarehell Wrote:  I have read the ROTATE section of the Manual and rotated my image (text single layer, A5 template) ...

No problem, but now I am left with an image with a grid over it lying at (46 degress now) across the black and grey chequered background with no idea how to save this as a permanent rotated version of my original image.
If you use the Rotate tool in the Tool box (the one that rotate b y an arbitrary angle), when used it pops a small dialog with the rotation information (angle, center) and a "Rotate" button. You have to click that one for the rotation to be applied.
However, if all you want is to apply a 90° rotation, it is much more efficient and proper to use the various "Layer/Transform/Rotate *" menus to rotate a layer or "Image/Transform/Rotate" for the whole image.

Hi

I tried the Layer/ ... /rotate and the Image/.../rotate for 90 degrees and it worked fine, thank you.

However if I try and use the Rotate tool for freehand rotation, I am left in the same position ... the rotated image lies over the black and white chequered background, and there it stays ... I don't know how to get rid of the background (or even if I need to, though it seems strange to have it there behind the image if it's not needed). I've tried Saving and closing and opening again, but it's still there. I know I am missing something really obvious, but I don't know what it is ... how do you get rid of the "chequered background", or does it just stay there permanently? The corners of the rotated image fall off the chequered background, so they can't be seen ...

I thought of doing a trial print but I can see from the Print Preview that I will just get an image with the corners missing where they "hang over the edge" of the chequered background ... looks stylish, but not what I was aiming at!

What am I failing to do?
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Jul 16, 2012, 14:44
Post: #4
RE: Rotate ... 90 degrees then stuck ...
[/quote]
The checkerboard background is the "canvas", more or less the table where you stack up the layers. Where you see it, either there is no layers above that point or the layers above it are transparent.

When you rotate a rectangular layer, Gimp automatically increases its size to be the smallest rectangle that holds the rotated image. You have to decide what you keep from this. In photography, after straightening an image, once usually crops it to the biggest rectangle that fits within the new rotated image. If you use the crop tool (Crop) the whole image (ie, all layers plus the canvas) is by default reset to the size of the cropped image. You can also just use "Image/Fit canvas to layers" to get the smallest canvas that encompasses all layers.
[/quote]

Thank you Ofnuts

Since then I have learned something about rotating with guides, from a book, and I have learned more about the "chequerboard", that it is marking out transparent layer/layers. I have also following a hint you gave found out how I might print a tilted image intact, by importing it into a bigger Template.

I am now stuck on Transform - Rotate. I think I am misunderstanding something basic about how it is meant to work.

If I use the dialog boxes, I see I can choose Normal (which I understand to be forward) or Corrective (which I understand to be backwards, or anti-clockwise).

But whatever number of degrees I put into the box (I am using 50, to make a very clear result) the image only ever rotates forwards. I am clicking Rotate, but usually, after calculating the rotation (green pie symbole in image) nothing happens even if I click in the image ... unless I click on one of the up or down arrows by the Angle box, then it moves it, and adds an extra .10 degrees because I have used the arrow!

Sometimes the image rotates and not the grid, sometimes the grid rotates and not the image ... the only values I am changing are the Normal/corrective and the actual number of degrees (with or without a minus).

The result seems to be unpredictable. I have tried a number of combinations several times without getting a predictable result ... except it always rolls clockwise. (And sometimes it does not rotate at all.) I can find no way of rotating freehand, or by filling in an angle reading, backwards except the "use the guides" method.
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Aug 6, 2012, 17:23
Post: #5
RE: Rotate ... 90 degrees then stuck ...
Hello Ofnuts

I have been doing a lot of practice on other things since then, partly using a book called GIMP 2.6 for Photographers, because it has exercises in it.

This doesn't make it dead simple either :-)

I read carefully what you said about Rotate, then I had a go or two at Normal and Corrective to try and find out what the difference is.

I find that in Corrective you must move the grid by hand till it is aligned with your crooked picture, then the program will turn it to vertical.

I find that in Normal it's fairly easy to move with the slider and up/down arrows to get it aligned by eye.

In the end I had to rope in a friend, who pointed out that I wasn't clicking in the right place at the right time, that the rotating grid was actually showing the preview not the image, and (maybe most important) the image I was using was big enough that the computer could not keep up with my clicks! So was seeming to do the wrong thing. (He did not know this, he just worked it out. This is where computing experience shows!)

I will remember what you said about Select mode and try to remain aware of where I am.

Yesterday I managed to put a speech balloon on a picture with the paint tool AND put some text on it! I am not quite sure what I did, but it worked, so I am getting somewhere!
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