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  Changes in 2024 for Ubuntu
Posted by: Tas_mania - 11-09-2023, 10:19 PM - Forum: Alternate Gimp packagings - Replies (14)

The Register has reported changes in the 2024 Ubuntu LTS system.

There will be a 'Core Desktop' and an 'Ubuntu Core' edition with a totally locked admin file system. I'm confused already, I hope they come-up with different names?

Quote:it's entirely built with a single packaging system: Ubuntu's Snap.

My experience is Snap is slower to load on older systems. Linux Mint is based on Ubuntu but does not use Snap. Which direction will they go?

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  Takes Forever to EXPORT an image
Posted by: OldSargeDaleD - 11-09-2023, 07:13 PM - Forum: General questions - Replies (6)

Dell XPS 8940
11th Gen Intel® Core™ i9-11900
32.0 GB 
Windows 11 Pro

I open a graphic image (anything from a JPG to a PNG to a TIFF)
I work on the file -- many times, simply cropping something out of the larger image
I Click File, I click Export

I just did this, creating a headshot for an Avatar on my genealogy software.
It took me 7 (count 'em SEVEN) attempts to get the file name into the input box and get it exported.
Gimp stalled out, it took me out of the Export dialog box and back to the main screen with my cropped image
I'd try again, and again, etc -- the program would go into "Not Responding" then it would time out (again) and I'd have to start over

Any suggestion?? 
Thanks 
Dale

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  MacOS Pinch to zoom
Posted by: Gimp_charles - 11-09-2023, 02:08 AM - Forum: General questions - Replies (3)

Hello. I thought for sure there would be a bunch of questions about this, but only found scattered results online most referring to linux.

Info:

Gimp 2.10.34
MacOS Monterey 12.2.1
Macbook Pro (2019)
Gimp user since: 2010

Trying to find a way to enable pinch to zoom in and out. I know it wasn't available for many years so had basically given up on it, but wondered if it had been implemented recently. I saw a couple random posts online that people were able to do it, so I started to wonder if it's a problem with my computer settings. Or did I misinterpret the posts I saw, and pinch-to-zoom isn't possible on MacOS at all?

Secondary question, if it's not possible in gimp, is there a 3rd party plug in that accomplishes this?

Any help is appreciated. Thank you so much.

Charles

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Photo Moiré or "wavy artifacts"
Posted by: sbalbarbin - 11-07-2023, 10:59 PM - Forum: General questions - Replies (4)

Hi all,

using GIMP 2.10.34 on Win 10

I have been getting annoying wavy lines (I would describe them as, you know those topographical map of mountains, that shows the difference of heights) that actually come from the gradual transparency of a layer after using the Eraser tool. Basically, using the Eraser tool, with a Force of 25% ish and Hardness of 13% ish (actually, whatever these settings are, it does it anyway). Attached is a screenshot of the entire GIMP layout (you will see all the Eraser settings). Only 2 layers active, so basically the one on top was opaque and I'm simply slowly and smoothly erasing it to reveal the layer under. At some point, I do want the top layer to be completely showing the one under it, but I do want a certain "gradient", and that thing happens right at the gradual transparency.

I once had that problem, few weeks back. It was the same problematic result, only, it came from duplicating a text layer and applying a gaussian blur on the layer below, in order to create a glow like effect. A friend of mine told me: check to see if you're in 8 bit Integer precision, and put it higher if it is. I actually was at 8, and I put it at 16 bits and this problem disappeared. So yesterday, I was, wait a minute, I suddenly have this problem but I'm in 32 bit?

So I'm confuse here... Anyone knows what causes this (I mean I know where it comes from) but is this a "normal GIMP" thing I will have to live with? Is there a way to get rid of it once you created it? Or is there a workaround to make sure I wouldn't get this?

Thanx a bunch in advance

Stef

   

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  Layer Mask Logic
Posted by: festus - 11-07-2023, 08:23 PM - Forum: General questions - Replies (1)

Hello,
I am wondering what the logic/reasoning is behind the use of layer masks.
Specifically, why, when you apply a mask to an image and you brush it, does the color from the below image appear?
Thanks,
fh

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  Use unique image in two or more layes
Posted by: Alejandro80 - 11-07-2023, 09:25 AM - Forum: General questions - Replies (5)

Hi,

I need to use one single image, and replicate it in different parts of the canva. So when I change the image, all the replication will auto change.

Please see the attached image as an example, where I have multiple layers showing different red dots across the canva.

Now I need to change this red dot to a different image, but I do not wish to go through all layers changing one by one. I would like to change the red dot in one single place, and affect all layers.

Is it possible to do something like that in Gimp?

Thank you in advance.


Please let me know if the explanation is not 100% clear. Thank you again.



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  Intesting subject and blend of then/now photographs
Posted by: Ofnuts - 11-07-2023, 12:55 AM - Forum: Watercooler - Replies (1)



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  Autocad hatch
Posted by: Gabe - 11-06-2023, 01:28 PM - Forum: General questions - Replies (3)

So I'm building a custom Cad hatch fill pattern for a software I use and like to make the individual travertine stones look like they have a little bit of depth. See attached. I was able to piece together one single stone with three or four different actions but, what a pain. Anyone know a quick way to do this?



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  What your mom never told you about PNG compression levels
Posted by: Ofnuts - 11-06-2023, 12:59 PM - Forum: Tutorials and tips - Replies (2)

The PNG compression level is that setting in the PNG options that is set by default to 9 and that everyone keeps that way.

But what is its purpose anyway since the compression is lossless? Once decompressed the image is still the same whatever the setting? So why is it an option?

It happens that the PNG compression algorithm is quite CPU-intensive so this setting tells the algorithm how hard it should try to find things to compress. Unlike JPEG where you trade file size for image quality, in the PNG format you trade file size for CPU during export, and on big images it makes quite a difference. So lets see what happens with four different images (16Mpix each except the photo which is 14Mpx):

  • A plain text (8 lines in a text layer with a large font), which is expected to compress very well (PNG is designed to be efficient on computer-generate images)
  • A Simplex noise which is random but with a large proportion of pure black pixels (about 50%)
  • A Plasma noise which is also truly random but is made slightly less random by applying a small median blur to it.
  • A photo of a gorgeous French village.
Each image was exported (without alpha channel) in the 10 levels of compression, measuring the final file size and execution time. Then the results were plotted, using the size relative to the uncompressed version and the relative time to compress:

   

For instance, in the Simplex case, the final size with compression is about 20% of the uncompressed size, and for level 7 the export took about 5 times longer than the uncompressed export.

These curves make it clear that in all cases, some compression is better than no compression at all.  However, past levels 4-5, there is a very substantial increase in compression time for little or no gain on the file size. In absolute numbers, given that the uncompressed export took a good half second, level 9 is nearly 18 seconds for the photo, when level 6, that produces a file which is less than 3% bigger, takes less than 4 seconds.

Choose wisely Big Grin

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  duplicates
Posted by: poiderh - 11-06-2023, 07:14 AM - Forum: General questions - Replies (2)

G'day, not quite Gimp related but hopefully being a photographic minded forum, just posing the question,  is there a way to find and sort or delete or separate doubles in my photos ?

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