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Information Add / Subtract / Intersect Selection Hotkey?
Posted by: gravanoc - 07-05-2022, 05:42 AM - Forum: General questions - Replies (1)

Using a select tool comes with four options for adjusting your selection: replace with, add to, subtract from, & intersect with current selection.  The last 3 can be activated by holding down Shift, Ctrl, & Ctrl + Shift, respectively, or you can click their icon to make them active without holding a key down.  Is there a hotkey that can do the same thing as clicking the icons?  I looked in the hotkeys menu & found some possibilities, but after assigning keys to them & trying them out, I found they did not work as intended.

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  Using GIMP 2.8.22, Moving Back and Forth Among Layers
Posted by: Songbird - 07-05-2022, 03:45 AM - Forum: General questions - Replies (4)

I just finished working with my 6th layer, and now I see that I need to go back to my 4th and 5th layers and adjust them. How do I toggle back and forth among layers?

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  how to deform a layer according to another one?
Posted by: DanielMalaga - 07-04-2022, 09:21 AM - Forum: General questions - Replies (6)

Hello,

I would like to deform one layer according to the information in another layer.
For example:

I have a photo of a lake, that I want t deform, and a photo of a face in an other layer that I want to use as the shape.
Now I want the water in the lake to be deformed in the shape of the face. Similar effect like using the warp tool but according to the shape in the other layer.

or

I have a photo and in another layer an image of crumbled paper. I want to "crumple" the photo according to the paper layer. Not just combine the layers somehow, but really deform the photo layer, so that it actually looks like crumbled.

I haven't found anything in google, but this might be because I am not able to express the right question...

Is there a tool, a filter, a script... that can do that?

Thanks for your help!

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  Saving TIFF Export settings - BigTIFF & Save Layers
Posted by: bernard.foot@btinternet.com - 07-04-2022, 09:19 AM - Forum: General questions - Replies (2)

I've just installed 2.10.32 on 64-bit Win10.

I normally export as TIFF. The new version provides BigTIFF format. However, I don't want to use this as nothing (inc. GIMP itself) seems to understand the resulting files. Similarly, I do not want to use the "Save Layers" option that was also present in earlier versions as that results in files that I cannot view or even delete.

If I uncheck these options, that choice only survives the current session. When I re-open GIMP, I have to remember to uncheck these options. This is a pain.

Is there any way to make my preferences pemanent?

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  Single stroke text paths
Posted by: mahvin - 07-03-2022, 05:57 PM - Forum: General questions - Replies (6)

I recall reading discussions on converting text to single stroke paths, most likely years ago, and cannot seem to find the discussion. Or perhaps I was dreaming it was possible and woke up and thought it was real. I am aware that text can be created to single stroke paths, and you can even buy such fonts, but...I seriously thought Ofnuts had already created this plugin. Getting old sucks, some days...

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  Question regarding Precision Setting
Posted by: ajax - 07-02-2022, 05:38 PM - Forum: General questions - Replies (4)

I recently read a tutorial where the procedure involved first converting an image to 32 bit floating point (FP) precision.  It now occurs to me that this might be wise/appropriate as a general rule.  In that, convert all images to 32 bit FP for the purpose of editing.  Do the conversion before anything else.  Then at the end of the editing pipeline the image can be converted to whatever precision is desired for the final product.

I have started experimenting with this idea but can NOT yet say I have much knowledge about the pros and cons.  However, I'm sort of guessing that one consequence of storing GIMP files (i.e., .xcf format) in 32 bit precision is that they will be larger (maybe a lot larger).  However, even if GIMP files are stored after performing editing operations in a lower precision format it might still make sense to perform edits in 32 bit FP precision.  Absent any real knowledge or experience I'd be thinking the benefit would be greater precision (? computational dynamic range) is the results.

Would love to here what real experts might have to say about such an approach.

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  Link text boxes together
Posted by: jake51188 - 07-02-2022, 03:53 PM - Forum: General questions - Replies (3)

How would you be able to change one text box and it change multiple other text boxes on the same layer or different layers? Ideally linking multiple text boxes together. 

Use case: I have a letter that sits on 12 places on an image. Every day I need to change that letter, instead of changing 12 different text boxes, could I just change one and it auto edit the rest?

Thanks,
Jake

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  GIMP primary set-up
Posted by: nickiwest2467 - 07-01-2022, 04:25 PM - Forum: General questions - Replies (4)

Hi

So I downloaded Gimp and began to use it, primarily for cloning and smudge. I click on view and zoom in, click on view again and zoom in again, and I do what I need to do. Things work fairly well. At one point or another I swear I was looking through tool options and saw the program set up like a paintshop. There were brush sizes, adjustments that could be made, edit colors, etc... tools and selection options across the top of the screen... the tools were displayed on the screen much like a paintshop.

Suddenly as I was viewing and zooming in, using the VIEW button, I hit something. Now the screen is full screen, with the ruler running up the left side and across the top. I can't seem to set it back to display the tools or options, and I have clicked every clickable thing in the world. The screen remains full size with no option to adjust the size of the tool I am using... I even removed the program and re-downloaded it! How do I adjust it so I have a different working view of the screen?

And since I am here... I use Windows 10 a lot, and it's image viewer is ok, it does fairly well with light-duty basic cosmetics. It has one flaw: With the spot remover, you can't adjust the size of the tool. The one cheat there is you can zoom in on the pic, more, more, MORE... and the pic gets HUGE, which causes the tool to be smaller, to an extent. I had hoped to do the same with Gimp. I zoom in more and more and the cloning tool zooms in with me! It's like hunting flies in the house with a sawed-off shotgun! Is there a way to set the clone and smudge tools to be smaller and more user-friendly?

I suspect there is. Choose a smaller size. Which I can't do, as I seem to be stuck on the one full-view screen and can't set it back to get to the options! Does that make sense? I hope so...   Confused

Any helpful tips would be most appreciated! Have a safe and happy holiday weekend! Thank you for your time and (hopefully) understanding.
Nicki ~

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  What algorithm is used for CMYK component extraction in gimp 2.10?
Posted by: leopardyao - 07-01-2022, 04:48 AM - Forum: General questions - Replies (5)

Dear Experts,
My gimp version is 2.10.22
For one of my project ,  I can see high contrast when I extract the "cmyk Yellow" component of the image.
I did this through colors-extract componet.

However if I try to recover this in other software or in programming,  the result differs.
For example, for one of the pixel value RGB= (150,136, 146) in my picture.
if I use gimp, the yellow channel gives pixel value 15.

But if I follow the popular formula here: 
https://community.adobe.com/t5/color-man...-p/1884317
or similarly follow the gimp github source code, gimp_rgb_to_cmyk
https://github.com/GNOME/gimp/blob/maste...lorspace.c
I got sth different:
CMYK percentage
0.0, 0.09, 0.03, 0.41
in 255 it is: (so yellow channel is 6)
array([  0,  23,   6, 105], dtype=uint8)
I tried to adjust the pullout but it seems not easy to get gimp CMYK results  matching with formula o

I do undestand there is no general formula between RGB to CMYK and sometimes icc profile is needed.
So the question is , what kind of algorithm is behind GIMP "CMYK yellow" channel extraction, is it by some icc profile? if so which? or if there is some gimp formula?

Thank you very much!



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  New style for inline code
Posted by: Ofnuts - 06-30-2022, 02:31 PM - Forum: Gimp-Forum.net - Replies (2)

Changed the style for inline code (which until now was shown with a small border) which you can enter by bracketing your text with backticks.  The border didn't do much good for readability, so I removed it, and found other ways (technically: font-family:Monospace; font-weight: bold; filter: contrast(50%);). Tell me how it looks (especially people using the dark theme).

Since this is applied at presentation time (the text is kept with backticks in the database), this change applies to all existing posts.

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