Transparent PNGs, What The Fuck

[CrystalWolf]

Well, I'm stumped. I've tried every possible way to apply transparency to my sprites, and it seems like XWE, Windows, IrfanView, Paint... Actually, it seems like everything except GZDoom recognizes that these PNGs have a transparent color. I really have no idea what I'm doing wrong and I would appreciate it if anyone would be kind enough to tell me what it is I'm missing. In the mean time, you all can take a peek at the little fragments of conceptual work I've done on this mod (hint: check the Sounds/ directory...)

http://www.filesavr.com/inmemorium

While I'm at it, I'd like to ask if anyone would like to help specifically with either the artwork or with some logical stuff like managing the scripts within the PK3. By artwork, I mean taking screenshots and erasing out the background, leaving just the weapon frames, as I've attempted to do here myself. Mapper(s) welcome too.

[Project Shadowcat]

With PNGs, you must set actual transparency and not use the color of cyan. A program like Paint can't do that so you need to grab something that can. Say, Paint.NET.

[Ceeb]

IrfanView is your friend if you need to do a whole ton of them at once. Just remember...

PNG > advanced > change color depth > 256 colors (8 BPP)

It doesn't hurt the colors at all, but for some reason, that's the only way it will work.

[CrystalWolf]

@ProjectDarkFox: I was setting transparency with IrfanView and simply using cyan as my transparent color, as it's what I'm used to.

What Ceeb suggested worked quite famously though. Thank you for the assistance.

[Ichor]

Gimp works quite well. Open a .png file, add a transparency alpha, then delete everything in the picture that you want to be transparent.

[Zhs2]

Magic Wand tool.

[bagheadspidey]

What's going on here is PNG supports two different kinds of transparency. With the most common kind of transparency, each pixel (for true color PNGs) or palette entry (indexed PNGs) has its own transparency info. This allows some pixels to be more transparent than others. The less common kind is only used with indexed PNGs, and works more like GIF transparency: one palette entry is defined as being fully transparent, and even though it has color information too, clients are supposed to render all pixels using that palette index as transparent. I suspect that this is the method you were using initially. So technically this could be considered a bug / feature request, because those pixels are indeed supposed to be transparent, it just sounds like (g)zdoom doesn't honor that part of the PNG spec.

edit - my interpretation of the tRNS chunk was a little off, apparently it's much less limited that I thought... but I still think this is what caused the problem.

[DOOMERO-21]

use "microsoft photo editor" is a nice program, can make transparent png so easily..., i really like more than photoshop.