annoying little white border line appeared in Gif animation

[dsfdsfs24388509]

Hello!

With photoshop CC 2018 I created a gif animation, clicking on "create video timeline" and then using the clock icon with the "transform", changing the w value to 1% at frame 100 . The original image was this png file: https://postimg.org/image/iq7f73hwb/  , the result this gif: https://media.giphy.com/media/gXPl17sWWZ0HndMPQW/giphy.gif

Both have and should have transparent background, I am 99% happy with the result. Unfortunately this annoying detail, at some point a thin white outside boarder around the question mark appeared. To demonstrate (since it might not be visible with the two images above) I saved a single frame, put it in front of a green background (for some unknown reason it came out dark grey instead of green, but that is not the point here). https://postimg.org/image/f99yhid97/

The thin white line is annoying since I will use the animation with another background later. I hope it is just a little check/uncheck a boarder setting or using an svg or whatever filetype as the origininal image or something with safe settings. Any ideas? Thanks in advance!

[Nancy OShea]

Looks like an aliasing problem (jagged edges).

Aliasing & anti-aliasing in Photoshop

[dsfdsfs24388509]

Thanks! Do I have to apply Anti Aliasing for the original image or the animation? Because I can not apply it for all the individual frames, unless it does it automatically.

[Nancy OShea]

I think you need to start over with a clean GIF.

[dsfdsfs24388509]

Are you saying I should save the original png as a gif, and then base the animation on that gif?

[dsfdsfs24388509]

I kinda solved it, that white only appears if there is no background. Once you put a background behind it its invisible, therefore its all good

[melissapiccone · Accepted solution]

A gif can only have 1 color transparent. You will always have a "halo" from the anti-aliasing. You can remove it and you will have a rough "stair-step" edge. It's best to place it on a solid color background to match the anti-aliasing color.

A png has alpha layer level transparency - 256 levels the same as a photoshop level. However, you can't animate a png.

[dsfdsfs24388509]

thanks, how can I decide what the color of the halo is? In this case, I would want it to be black http://playground.e-smog.org/gimpforum/gif-bg.html

[melissapiccone]

Create your image on a black background, then the edges will be belack if you make black transparent.

[dsfdsfs24388509]

I tried, so its two layers, one is the animation, black boarder, outside of it all transparent.

Layer 2 is black.

I thought stacking the black layer 2 on the bottom would automatically set it at background, but instead the whole animation was black when I replayed it.

It first automatically changed Layer 1 to "darken", (left of the opacity menu on the lower right side of the screen). That made every thing black.

Another question, which of the two layers do I change black -> transparency?

[dsfdsfs24388509]

I just found out the easiest way:

In the Safe for Web menu, there is "Matte" on the upper right side. Changed it to black, so the halo is gone (or more precise: the halo is black now, so completely blending in with the black boarder of the question mark)

https://s17.postimg.org/o5jhy15zz/qm-500-500-matte-black.gif 

[Jaskirat Saini]

Use "FXAA" Plugin. It's free and works like a charm!
PRO TIP: Duplicate the effect until you reach the desired result.

[Link to FXAA removed by moderator since it is not a Photoshop plug-in. (Thanks @Paul-BU ) ]

[Paul-BU]

This thread is about photoshop GIFs and the FXAA plugin is for After Effects, just FYI to anyone who sees this post above.