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

[Tom F. <to...@mu...>]

There's nothing wrong with TGAs as a format - they support alpha channels
just fine, and so does Photoshop. One of our artists just showed me that
indeed it works just like you'd want (Photoshop 6.0 - we're just trying 7.0
now). What specifically is going wrong?


Tom Forsyth - purely hypothetical Muckyfoot bloke.

This email is the product of your deranged imagination,
and does not in any way imply existence of the author.

> -----Original Message-----
> From: Andrew Grant [mailto:ag...@cl...]
> Sent: 31 July 2002 15:13
> To: gam...@li...
> Subject: [GD-Windows] Image formats (was [Algorithms] Scrolling
> starfield)
> 
> 
> 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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