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Brushes looking jagged, all black on Gimp 2.8

Nov 14, 2012, 01:15 (This post was last modified: Nov 14, 2012 01:20 by stampnbrush.)
Post: #1
Brushes looking jagged, all black on Gimp 2.8
Hello!

One of the features I use most is the brushes. However, when I installed Gimp (2.8) on my new laptop, my favorite brushes no longer work properly:

* they're jagged, pixelated, or the finer lines are interrupted - instead of looking smooth
* I can't change the color of them; they just show up black

I made a comparison of screenshots so you can see. Same brush, same size (even though one version says "scale" and the other "size," I made them both go up to the 100 pixel mark, and you can see that the brush's natural size is larger than that), same canvas size.

On my old laptop, I had Gimp 2.4.1 and the OS was Windows Vista, 32-bit. Here the brushes looked right:
http://i.imgur.com/L9V90.jpg with "use color from gradient selected"
http://i.imgur.com/ROD3Q.jpg without "use color from gradient" selected


On my new laptop, I have Gimp 2.8 and the OS is Windows 7, 64-bit. Here, I can't use the color from the gradient, and the brush doesn't look smooth (and the finer lines are interrupted):
http://i.imgur.com/9wv9s.jpg


Does anyone know how I can fix these problems? Using brushes is essential to what I use Gimp for, so this is very frustrating. Sad Any help/insight would be greatly appreciated.

Thanks in advance! Smile
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Nov 14, 2012, 10:13
Post: #2
RE: Brushes looking jagged, all black on Gimp 2.8
Seems to be the case, a lack of anti-aliasing with these brushes.

Best I got was change the brush dynamics type to 'Basic Dynamics' and reduce the 'Smooth' value to 0.

screenshot http://i.imgur.com/ZXfLj.jpg

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Nov 15, 2012, 06:14
Post: #3
RE: Brushes looking jagged, all black on Gimp 2.8
Thank you so much for your replies!

ofnuts
I couldn't find a Brush Dynamic named "gradient" (so I'm sure I'm understanding you wrong - I'm completely new to this whole Brush Dynamics business). The closest I found was "Random Color," which yielded the following:
http://i.imgur.com/jj1OB.jpg
But then the brush shows up as pink instead of the full red I had chosen. I can layer them on until I get to bright red, but is there a way to get it to show up red the first time?

These are the brushes: http://redheadstock.deviantart.com/art/F...s-80455211
It happens with other of my favorite brushes as well, but this pack is the one that includes the brush I was using as an example. I tried finding the single "GIMP brush#41" in the "brushes" folder but it's packed into one single .abr together with the other brushes in the pack, so I wasn't able to isolate it.


rich2005
I'm not sure how I would determine if the brushes are anti-aliased... Could you please take a look at the sample brush set I linked to in the paragraph right before this and let me know if this is the case, or tell me how I can find out?

Using Basic Dynamics and reducing the Smooth to 0, I get the following:
http://i.imgur.com/Z2g1y.jpg
So, pretty much the same result that I was getting with the "Pressure Opacity" dynamic (I didn't actively choose that; it was selected by default), except that when I'm moving the cursor around the canvas to set the brush over the part where I want it, it's constantly changing size, so it's confusing me because I'm not sure what size it's going to come out in Confused And also if I apply the brush again, the second is automatically bigger, which is not what I want. Is there a way to stop it from changing size? I've noticed that with other Dynamics, the brush cursor rotates quickly. Is there a way to get it to stay still? With brushes like this one, I don't drag it, but rather use it like a "stamp," so I want to be able to precisely control size and location.



Also:
I tried the single window mode, didn't like it, switched back to multi-window mode, but now I only have two windows instead of 3. I've been clicking and dragging, trying to separate the Tools frame from the Layers frame and make those two separate windows again, but I haven't been able to. How does one do that?

Thanks again for your help! Big Grin
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Nov 15, 2012, 09:21 (This post was last modified: Nov 15, 2012 13:29 by rich2005.)
Post: #4
RE: Brushes looking jagged, all black on Gimp 2.8
Quote: "snipped a lot"...I'm not sure how I would determine if the brushes are anti-aliased... Could you please take a look at the sample brush set ...Using Basic Dynamics and reducing the Smooth to 0, I get the following: ..pretty much the same result that I was getting with the "Pressure Opacity" dynamic ...when I'm moving the cursor around the canvas to set the brush over the part where I want it, it's constantly changing size

Anti-aliasing are the semi-transparent pixels along an edge that fool the eye into thinking 'smooth'
If the brush is constantly changing size then you are not in "Basic Dynamics" You probably selected "Basic Simple" by mistake.

This is your brush, zoomed-in, with a comparison of the settings, not a big difference but closest I got to the Gimp 2.6 settings.
http://i.imgur.com/0PMMZ.jpg

edit: A bit of spare time and another look, I stick with previous findings but I did notice that the change in brush dynamics did not set in immediately. It might be the effect of using this 'brush' as a stamp rather than painting with it. But if there is no visible effect then back off with an undo (ctrl-z) and try again.

Quote:I tried the single window mode, didn't like it, switched back to multi-window mode, but now I only have two windows instead of 3...

Go into your ./gimp-2.8 folder and rename sessionrc to something else, say sessionrcbak. Start up Gimp, should be back to default windows.

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Nov 15, 2012, 14:21
Post: #5
RE: Brushes looking jagged, all black on Gimp 2.8
Still looking at smoothing those abr brushes

It is another step to do, but might improve matters. The GEGL operation 'ditto' will smooth the shape.

It will mean putting those stamps on another layer for processing so other parts of the image are not affected.

A simpler abr, easier to see the effect.

http://i.imgur.com/FpbNz.jpg

black is default, red and blue have been 'ditto'd on the top layer

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Nov 17, 2012, 06:35 (This post was last modified: Nov 17, 2012 06:41 by stampnbrush.)
Post: #6
RE: Brushes looking jagged, all black on Gimp 2.8
Thank you so much for your help and your time looking into this, rich2005! I truly appreciate it!

I was indeed using "Basic Dynamics;" when you mentioned it, I looked for "Basic Simple" just to double-check and I didn't have it available as an option at all o.O. Anyway, the cursor didn't change size a ton, but still enough to make a difference (and seeing it actively change size all the time was distracting). Maybe it's what you said about the Dynamics settings not taking effect immediately.

I looked around through all the menus and settings and was not able to find either "ditto" or anything called GEGL.

At this point, I started thinking that something may have gone wrong during installation, so I uninstalled it and got rid of my "gimp 2.8" folder in the User directory and was going to try re-downloading and installing again, but your mentioning 2.6 gave me the idea to try installing that instead.

I wasn't sure if it was going to work on Windows 7, 64-bit, especially because I'd read a lot of people complaining about version 2.6 (I had skipped it and had gone from 2.4 on a Vista computer to 2.8 on this one) but I thought, "hey, if I installed an old version of Office on this computer and it didn't die, I'll give this a shot" - and so far it works! *huge relief* I reimported all my brushes and tested them and they look normal, the cursor doesn't change size, and, as far as I can tell, the interface is just like that of 2.4. So far, I don't think I'm having compatibility issues, but I've only tried it for like 2 hrs. Fingers crossed it keep working properly!

Anyway, once again, thank you SOOO much for your help and for taking the time to look into this and the specific brushes!! Really appreciate it!! Big Grin

Best regards!
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Jul 17, 2013, 03:15
Post: #7
RE: Brushes looking jagged, all black on Gimp 2.8
I have been experiencing the same thing for some time now and have not been able to resolve the issue. I've used gimp 2.8x in ubuntu, windows 7 and on the mac os.

Screenshot on Mac Gimp 2.8.3 http://i.imgur.com/5Hk1Lnw.jpg
Screenshot on Windows 7 Gimp 2.8.2 http://i.imgur.com/JM0iSwq.jpg
Screenshot on Ubuntu 12.04 running Gimp 2.8.6 http://i.imgur.com/7IYYldI.jpg

The Ubuntu screenshot shows the difference in jagginess when scaling. The bottom calligraphy brush is full size, while the top one is scaled much smaller.

Despite the fact that these screenshots are of .abr files, my first realization of this issue was when creating gimp brushes in linux. It appears that the brushes become jaggy when the size is changed from the default size of the brush to a smaller size. So this is not specific to .abr brushes. Because the brushes that I create are rather large to begin with, I have not tried scaling them larger to see what happens.

So my inital goal with all of this was to create a bunch of freebie brushes/resources exclusively for gimp users. This pixelation/jagged edge issue has prevented me from doing so.

I am well aware that the development of this software takes a tremendous amount of time and dedication. I have much gratitude for those who make this all happen. So basically my goal here isn't to whine about it but to put forth some feedback in relation to operating systems/version numbers of gimp.

I am new to the whole dynamics brush thing, so maybe my settings are off. Any help would be greatly appreciated.

           
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Jul 17, 2013, 14:34
Post: #8
RE: Brushes looking jagged, all black on Gimp 2.8
I can post some brushes however, if you look at the screenshot in comparison of how the same brush scales in photoshop vs. gimp. Now I am not trying to be hard nosed, it is just that gimp *did* scale brushes in a smooth manner *before* version 2.8 came out. I can try uninstalling say on my laptop and go with a pre-2.8 version and post the output as well.

http://i.imgur.com/AM60rlu.jpg


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Jul 17, 2013, 18:42 (This post was last modified: Jul 17, 2013 18:42 by starsunflower.)
Post: #9
RE: Brushes looking jagged, all black on Gimp 2.8
So here's the test with gimp 2.6 in xp. The bottom image is full size, and the top to are scaled. They don't look quite as pixellated or jaggy. The edges are softer.

http://i.imgur.com/HRnl0nA.jpg

By the way, here are the brushesPaintbrushHeart


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