Re: PNGs with transparency & user's color depth settings

[Chad Mefferd (Morris Publishing)]

on 8/24/01 10:12 AM, Gene Fritzinger at [EMAIL PROTECTED]
wrote:

> Hello list,
> I'm considering using PNGs with transparency to create an interface window or
> mask with a soft drop shadow, that will be used to display and scroll a larger
> bitmap under it. Aside from the larger file size, all works well except if the
> user's color depth settings are less than 16-bit (256 colors), in which case
> the colors look awful and I loose transparency.  Is there another approach
> that will acheive the same effect without loosing the visual impact of the
> soft drop shadow but will also work equally well even if the user's color
> settings are only 256 colors?
> 
> Thanx for any input,
> g fritzinger
> 
> 
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> 
I'm not sure it will be possible to display your images at 256 colors with
out some degradation as they require a 256 color pallette and 8-bit images
created within the range of that pallette to interpret the color. if you
intend to display at 256 colors all of your images will need to be converted
to 8-bit and you will need to create or assign an appropriate pallette. even
so passing 8-bit images over each other will probably push some of colors
out of the range of your pallette (hence the awful colors). do you really
need to be able to display at 256 colors?




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