RE: [GD-Windows] Image formats (was [Algorithms] Scrolling starfield)

[Phil T. <ph...@mi...>]

If this is really a stumbling block then you can always write support
for PSD files.  They are actually pretty easy to use since the flattened
image is stored at the end of the file in separate color channels
(r,g,b,a,...).

This actually let's you do interesting things like allowing the artists
to create images with more than 4 channels that you then split into
multiple textures yourself (for example when you need a gloss map in
addition to all the other color information).

Plus the artists will like you that much more since they don't need to
juggle around two file formats.

Phil

-----Original Message-----
From: brian hook [mailto:bri...@py...]=20
Sent: Wednesday, July 31, 2002 8:11 AM
To: gam...@li...
Subject: Re: [GD-Windows] Image formats (was [Algorithms] Scrolling
starfield)

> What formats are people using for images these days? We're currently=20
using
> TGA which "suffices" but isn't great due to Adobe less than embracing=20
the
> concept of alpha channels.

Photoshop 7 completely and utterly broke TGA support, but you can=20
supposedly go back and get the TGA exporter from PS6 and copy up to PS7=20
and it starts working again.

This is OT, but damn, Adobe has the most piss poor attitude I've ever=20
seen.  When this TGA screwup was brought to their attention, their=20
response was three fold:

- testers should have pointed it out to them, hence it's not their fault

- no one mentioned that alpha was being used "that way" (for games)

- using alpha channel "that way" is clearly against the spec, and game=20
developers are relying on "broken" behaviour (i.e. TGA support in PS up=20
through PS6), so it's really their fault

That, coupled with the completely broken PNG support in Photoshop, has=20
just made me really dislike Adobe.

Anyway, we use TGA, JPG and PNG.  TGA if we need alpha or 16-bit; JPG=20
if we need lots of compression; and PNG if we need the files to be=20
compressed individually.

-Hook




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