.png transparency and gem

Reply to .png transparency and gem on Sat, 16 Apr 2011 03:49:53 GMT

katz — Sat, 16 Apr 2011 03:49:53 GMT

Hi,

Is there a way to see through the transparent background of .png images?

I set up four separate gem-heads, each importing .png images to add as textures to squares with the same dimensions, stacked on top of each other. I was hoping to be able to see through all 4 images to the gemwin background, but I only see the opaque parts of the top layer and a white background.

Reply to .png transparency and gem on Sat, 16 Apr 2011 06:22:03 GMT

katz — Sat, 16 Apr 2011 06:22:03 GMT

I can't seem to think critically until I've made a post...

I ran an image through two pix_alphas (one passing white and the other passing black) and that did the trick (no greys yet). If I set the background of the original file to a certain color I can target that color and remove it, creating a transparent background.

Reply to .png transparency and gem on Wed, 20 Apr 2011 05:45:27 GMT

godinpants — Wed, 20 Apr 2011 05:45:27 GMT

I had alphas work for me in the past, on a .png mapped to a sphere. I'll check my patching tonight.

Reply to .png transparency and gem on Wed, 20 Apr 2011 10:34:58 GMT

sonsofsol — Wed, 20 Apr 2011 10:34:58 GMT

it definitly works with tifs

and you need no pix_alpha, but :

[gemhead]
I
[pix_image]
I
[alpha 0]
I
[pix_texture]
I

instead.

Reply to .png transparency and gem on Wed, 20 Apr 2011 10:44:52 GMT

godinpants — Wed, 20 Apr 2011 10:44:52 GMT

i dont even have a 0 on my alpha. Seems to work with gif and png

[gemhead]
|
[pix_image]
|
[pix_texture]
|
[alpha]
|
[cube]

Reply to .png transparency and gem on Thu, 21 Apr 2011 00:01:29 GMT

katz — Thu, 21 Apr 2011 00:01:29 GMT

Yah it does work.. (with multiple gem-heads & pix_multiimage too) but all the images are black and without color. How do I fix that?

EDIT***

Fixed. I've never had to use the "color" object in the chain yet.

Reply to .png transparency and gem on Thu, 21 Apr 2011 00:19:24 GMT

godinpants — Thu, 21 Apr 2011 00:19:24 GMT

perhaps you could upload your patch + images so we can help finding any issues?

Reply to .png transparency and gem on Thu, 21 Apr 2011 16:54:25 GMT

katz — Thu, 21 Apr 2011 16:54:25 GMT

I attached the working example and a png image.

I'm having trouble getting other objects like pix_grey or pix_invert to respect the transparent layer. Any ideas?

Edit*** pix_2grey works instead of pix_grey

http://www.pdpatchrepo.info/hurleur/testimage.png

Reply to .png transparency and gem on Thu, 21 Apr 2011 16:54:25 GMT

katz — Thu, 21 Apr 2011 16:54:25 GMT

I attached the working example and a png image.

I'm having trouble getting other objects like pix_grey or pix_invert to respect the transparent layer. Any ideas?

Edit*** pix_2grey works instead of pix_grey

http://www.pdpatchrepo.info/hurleur/testimage.png

Reply to .png transparency and gem on Wed, 09 Aug 2017 05:18:57 GMT

creiglee — Wed, 09 Aug 2017 05:18:57 GMT

PNGs create transparency in one of two ways. One of these methods employs the same approach used by GIFs, with a single color defined as transparent, and the other is to set an alpha channel . One of the advantages of PNG single-color transparency is that it doesn't remove a color from the available palette. However, the alpha channel is a much smoother method, as it is far better at blending colors, and allows you to select different levels of transparency in specific regions. The transparent areas of the PNG will blend and adjust naturally to whatever is behind the image when the background of the page isn't a solid white or black color.