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Should I use PNG8 or PNG24? What settings should I use for PNG8?

   
9:28 pm on Sep 2, 2004 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



Guys, just wondering I want to perserve image quality as much as possible w/o creating a huge file. The image is for web. I intend to use PHP program to convert the PNG to JPEG.

Should I use PNG8 or PNG24?

In Photoshop 7, I saw so many settings...

Dither: 78%
Web Snap: 54%
Colors: 256
Diffusion / Pattern / Noise

What's the optimal settings?
Also, when I want to set transparency for this image in PNG8, I couldn't find where I could set the color to be transparent.

Could anyone help?

Thanks.

9:49 pm on Sep 2, 2004 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member



8 bit PNGs use an indexed color palette like GIF. If you want variable transparency, use 32bit PNGs (24 bit color, 8 bit alpha). If you don't care about transparency, use 24 bit PNGs.

If you have areas of solid, even colors then you may be able to get away with an 8 bit PNG, but you will likely need 24 bit PNG for reasonable color reproduction. 8 bit PNGs (or less) are optimal for size. 24 bit PNGs (or 48 bit PNGs) are optimal for color reproduction.

When I last used PSP, you needed to set the transparent color in the color palettes, not when you save the image.