Color Palette : support alpha/transparency

piskelapp / piskel

A simple web-based tool for Spriting and Pixel art.

http://piskelapp.com

Apache License 2.0

11.04k stars 768 forks source link

Color Palette : support alpha/transparency #33

Closed grosbouddha closed 10 years ago

grosbouddha commented 12 years ago

For now, we don't support partial opacity for colors. We either show 100% opacity colored or totally transparent pixels.

Do we want to support opacity pixels in the future?

May lead to a bunch of problems/new challenges:

GIF format does not support semi transparency, we may need to move to/dual-support animated png
How do you manage overlapping layers of semi-transparent colors? mixed, overlay, discard the first one ?
how do you manage a future canvas color picker?
increased complexity (one addtional param to manage a fill color)

Evident benefits are:

more POWA!
antialiasing

For now, I'm good not supporting that but I'm curious of your point of view, pros and cons on this one.

juliandescottes commented 12 years ago

In short : yes opacity is a must (think about lights, explosions).

GIFs : the tool is actually supposed to create spritesheets PNGs. The goal for me was always to create something I could use to build small 2d games. (google spritesheet if you don't see what I mean). GIFs are just a funny counterpart but we don't need a 100% fidelity.

Overlapping layers : I think layers should mix/combine naturally. Let's just copy what photoshop and co are doing for the fusion of layers.

Color picker : If you are talking about the color picker widget, I'm not worried, let's just add an opacity slider. But maybe I didn't fully understand the question :)

Increased complexity : yes ...

juliandescottes commented 12 years ago

Changed the label of the issue to enhancement since this is definitely something we want.

Forkk commented 8 years ago

Why is this closed? Seems like a pretty important feature.

juliandescottes commented 8 years ago

It's closed as duplicate of #210 , forgot to reference it here

However no progress has been made on the other ticket either, except I prototyped it and it was too slow to be usable.