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Animations - pixelated

May 6, 2012, 08:52 (This post was last modified: May 6, 2012 08:54 by shef.)
Post: #1
Animations - pixelated
I followed this turtorial : http://nelsoncentral.wikispaces.com/Anim...s+and+GIMP

and created a banner in GIMP 2.6 that when viewed with the playback function looked fantastic and just what i wanted. However when i hosted it up on my server it looked awful and terribly pixelated and blotchy. The same as when saved i viewed it on my pc it looked awful.

Any ideas why the transformation in playback being perfect and when saved totally awful? I'm guessing the tutorial part on how to save the file isn't spot on?

Thansk for any help or advice.
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May 6, 2012, 10:35
Post: #2
RE: Animations - pixelated
First thing to check is of you get the same pixellated look if you open the file directly in your navigator (e.g.: start Firefox, "File/Open..." and navigate to the GIF).

If it's ok in your navigator, the hosting site may have altered the file or the HTML is forcing a display size which is slightly off.

Otherwise the pixellated look may be due to the color indexation that occurred when you saved to GIF. Is the XCF image in RGB mode or in indexed mode?

PS: hard to discuss this without seeing the image...

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May 6, 2012, 11:40
Post: #3
RE: Animations - pixelated
Hi ofnuts, appreciate you stopping by to offer help

In my browser it looks the same - pixelated. I have just cobbled together 3 pictures and followed the tutorial again and as you can see the ceiling on the room picture is "bubbly" as well as the wall in the dirty kitchen. On the bloke mopping you see the pixels on his back? This is the type of thing i mean.

[Image: another.gif]


Whilst doing this though i did spot something that maybe the problem perhaps? I set the frame blend at 5, yet when i came to add the delay 600ms on the next picture, the most clearest new picture was around 7-8 frames in. Frame 5 was half way between images hence i looked at the next ones until it seemed the clearest. Should i not have done this and stuck to frame 5 perhaps?

Thanks
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May 6, 2012, 15:31
Post: #4
RE: Animations - pixelated
What you see is called "dithering" and is a consequence of the low number of colors that can appear ina GIF (256 colors total to share among all the frames). It is made on purpose... without it, slow color gradients (board meeting table, floors, walls, reflections on the steel lift) translate into much more visible uniform color bands:

[attachment=1129]

But I'm pretty sure that you can get equivalent results with 3 Jpeg images and a bit of javascript in your HTML page.

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May 6, 2012, 16:03 (This post was last modified: May 6, 2012 16:04 by shef.)
Post: #5
RE: Animations - pixelated
Many thanks for clearing that up. I was trying to do it this way as javascript is like magic to me and i have no idea how to code or even where to put it on a page! Guess i thought GIMP would do all the hard work for me and i'd just need to upload end results!!!

Do appreciate you helping and informing me about dithering and the reasoning. Although wish it could have been as clear as the play function within GIMP.
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May 6, 2012, 20:11
Post: #6
RE: Animations - pixelated
There are other animation formats that support more colors (but aren't as widely understood by browsers as animated GIF), and the animation preview cannot guess that you are going to save as GIF.

Look around, you should be able to find ready-made javascript for this sort of things.

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May 7, 2012, 19:05
Post: #7
RE: Animations - pixelated
Hey thanks buddy, found a program called WOW Slider. nice and simple for idiots like me to be able to manage.

Appreciate help and pointers.
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