Anti-Aliasing, How do I do it?

Givera · **Joined:** Sep 13, 2015 **Posts:** 17

GIMP Version: 2.8.14
Operating System: Windows
OS Version: 10
GIMP Experience: Basic Level

Attached is the xcf file in which I made something with lots of squares atop each other on different layers. Notice the edges looking so unsmooth and ugly. I know there's a way to get rid of that possibly called antialiasing but I don't know how to use it on multiple layers. Any help?

Also any tips and suggestions for making the image look better are welcome.

Attachment:

squaryspiral.xcf [403.27 KiB]
Downloaded 230 times

Oregonian · **Posted:** Fri Oct 16, 2015 10:27 am **(#2)**

The antialiasing looks adequate on it to me.

What is your definition of antialiasing?

Givera · **Joined:** Sep 13, 2015 **Posts:** 17

The top pics.
The edges of the squares don't seem the way they should if they were antialiased. I don't even think there are those darkened blurred pixels over there when they should be.

Wallace · **Posted:** Fri Oct 16, 2015 11:33 am **(#4)**

Raster graphics are infamous for their anti-aliasing properties, or lack there of.
That's why I created this image below using a square path.
That was rotated,
scaled to the needed size,
stroked and then finally filled with the desired color for each of the squares.

Your image @ 800% magnification.

Attachment:

Capture A.PNG [ 61.68 KiB | Viewed 8407 times ]

Image made using paths, @ 800% magnification.

Attachment:

Capture B.PNG [ 48.47 KiB | Viewed 8407 times ]

I'm curious about how you made each square,
did you use the Rectangle Select Tool :rectsel

or prehaps the Free Select Tool :freesel

?

Attachment:

File comment: Here is the XCF file of the image above.

sq example.xcf [157.7 KiB]
Downloaded 118 times

ofnuts · **Joined:** Oct 25, 2010 **Posts:** 4812

Givera wrote:

GIMP Version: 2.8.14
Operating System: Windows
OS Version: 10
GIMP Experience: Basic Level

Attached is the xcf file in which I made something with lots of squares atop each other on different layers. Notice the edges looking so unsmooth and ugly. I know there's a way to get rid of that possibly called antialiasing but I don't know how to use it on multiple layers. Any help?

Also any tips and suggestions for making the image look better are welcome.

Attachment:

The attachment squaryspiral.xcf is no longer available

Remaining stray faint lines on some layers make me think that you selected/rotated layers... This damages the existing anti-aliasing pixels.

Attachment:

squaryspirallines.png [ 22.8 KiB | Viewed 8373 times ]

You have to create the squares directly. Create a square path, and then for each step, make a copy, rotate/scale it, create a selection from the result, and bucket-fill the selection.

Attachment:

squares.png [ 22.56 KiB | Viewed 8373 times ]

Wallace · **Posted:** Fri Oct 16, 2015 4:08 pm **(#6)**

ofnuts wrote:

Remaining stray faint lines on some layers make me think that you selected/rotated layers...
This damages the existing anti-aliasing pixels.

Attachment:

squaryspirallines.png

You have to create the squares directly.
Create a square path, and then for each step,
make a copy,
rotate/scale it,
create a selection from the result,
and bucket-fill the selection.

Attachment:

squares.png

Ofnuts's the man when it comes to paths,
it's best to take his suggestions...
:roll:

Givera · **Joined:** Sep 13, 2015 **Posts:** 17

Thanks guys.
I just was alpha-to-selection-ing the previous layer, shrinking it by 30 px, filling with color and rotating whatever angle to make it touch the previous one's edges.