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Raistlin
Registered: Mar 2007
Posts: 565 |
C64GFX - Image Formats
I'm starting to think about "better" ways to categorise images on C64... and whether images just need multiple toggles/options for different things. Eg.:-
Image: Picture, Logo, Font
Type: Bitmap, CharSet, PETSCII, other?
Colour Mode (Main Screen): HiRes, MultiColor, FLI, Mixed?, Other
Interlace: 1 frame, 2 frames, more?
On-Screen Sprites: no/yes
Top/Bottom Border Sprites: no/yes
Side Border Sprites: no/yes
Rasters: no/yes
Multi-Screen: Horizontal, Vertical, Diagonal 1x1 scroll, Diagonal 2x1 scroll, Large, etc..?
Animated: no/yes
Other: .. option to write notes here
^^ there's probably even more than that.
That feels like a lot.. is it overkill? Is it useful? Is it even possible to determine all these things for (currently) ~16,000 images. For regular MC and HiRes, I can add code to my toolset to find these, along with marking which images extend outside of the regular screen area (which can be a sign of rasters, sprites, or just a bad screenshot).
Is any of this even useful..? Maybe I should only be caring about the mass-market formats and just calling the others "extended"? |
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Deev
Registered: Feb 2002
Posts: 206 |
Quote: Quote:The interlace modes actually looked quite nice on a real setup back then. Horrible on the emulator!
I don't agree with that - at all. Not as a generic statement anyway. There have been LOTS of interlace pictures that were a terrible flickering mess, and the only reason for why they rated high in compos were the slow and crappy projectors of that time, which hide that fact.
And of course - a ton were just (bad) converts. Everyone did it.
But bad execution and converts can exist with any graphics mode. I agree with Joe that on a CRT a well-made interlace image looks nice. |
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spider-j
Registered: Oct 2004
Posts: 445 |
Quoting JoeThe interlace modes actually looked quite nice on a real setup back then.
Probably even back then it was a matter of screen and taste. With my first Commodore 1802 I always found the flicker graphics annoying.
@topic: "non standard" is also future proof :-) |
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chatGPZ
Registered: Dec 2001
Posts: 11121 |
Quote:I agree with Joe that on a CRT a well-made interlace image looks nice.
"well made" is the key there. That's the exception though, not the norm. Very often they are just drawn (if not straight converted) as if there is a 320x200 mode, and the result is a flickering mess. |
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Deev
Registered: Feb 2002
Posts: 206 |
Quote: Quote:I agree with Joe that on a CRT a well-made interlace image looks nice.
"well made" is the key there. That's the exception though, not the norm. Very often they are just drawn (if not straight converted) as if there is a 320x200 mode, and the result is a flickering mess.
If converted graphics exhibit problems that the best hand-pixelled graphics don't then blame the converter.
Images were often drawn at 320x200 on a PC, but it's easy to do this whilst also considering how the final release might look. I'd heavily anti-alias high contrast edges and most importantly test the final file and fix any trouble spots.
And even the flickering messes look better on a CRT. |
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chatGPZ
Registered: Dec 2001
Posts: 11121 |
And those high contrast edges will most likely still be headache inducing. No thanks :) |
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Deev
Registered: Feb 2002
Posts: 206 |
Quote: And those high contrast edges will most likely still be headache inducing. No thanks :)
I'd have eliminated those :) |
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Raistlin
Registered: Mar 2007
Posts: 565 |
I do find screenshots on interlace images “interesting”…
So if I flicker between a full screen of white, and a full screen of white, which will “probably” be a little bit flickery… I can just upload a pic that is full screen mid-grey (0x808080). |
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chatGPZ
Registered: Dec 2001
Posts: 11121 |
Why not use anigif? :) |
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Raistlin
Registered: Mar 2007
Posts: 565 |
Hah. I of course meant black and white alternating not white and white.
AniGIF would be the way, yeah - but someone mentioned that animated GIFs are a problem on website (which is news to me)? |
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Jetboy
Registered: Jul 2006
Posts: 217 |
Quote: Hah. I of course meant black and white alternating not white and white.
AniGIF would be the way, yeah - but someone mentioned that animated GIFs are a problem on website (which is news to me)?
For normal animated gifs there are not much problems with them.
For using them to display interlace images, there is a problem that you cannot expect stable* framerate from them.
*it is more of a problem that they are not synchronized with your display refresh rate, and flickering will be even worse. |
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