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

[Andrew G. <ag...@cl...>]

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

Ideally I'd like something that

Supports an alpha channel
Supports 32, 24, & 8 bit images

I'm not sure if anything out there actually fits the bill for this though.
I've thought about writing a plugin for Photoshop to supported saving to
targa's that fit the above, but it looks like a whole lot of pain.

Ta.

Andrew Grant-
Climax Brighton 



-----Original Message-----
From: brian hook [mailto:bri...@py...]
Sent: 31 July 2002 06:39
To: gda...@li...
Subject: Re: [Algorithms] Scrolling starfield


> (That code is a few years old.)  PSD has alpha, and RLE.  Plus it's
> easy to export from Photoshop :) I even used the print-size meta info
> to size my billboards.

I didn't even realize PSD was a documented and/or open file format.  
File format support these days is rather trying -- I use TGA by 
default, primarily because it's more predictable than what I get when I 
save PNG in various packages.  And TGA compresses very well (similar to 
PNG, if not identical) when ZIPped.  And it supports a 16-bit file 
format for those of us still stuck in the dark ages. =)

> > - rationale for WEATHER_BLOCK_SIZE = 14?
> 
> Just tweaked until the furthest flakes were invisible.

Ah, okay, just wanted to make sure I wasn't misunderstanding what it 
was.

I mucked about with the code and it works beautifully!  It took me a 
bit to get my head screwed on straight with respect to scale at times 
(the << 17 threw me off for a bit), but it seems to work.  

I have the ship centered in the star cloud right now, which looks wrong 
because stars can get between you and the ship, but a simple 
translation "behind" the ship should fix that.

The packing into integers and letting integer wrap handle wrap around 
is just brilliant and elegant, if not obvious to everyone but me =)

Brian




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