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Forums > C64 Coding > Bitmap fade in/out helper tool
2018-04-14 12:47

Registered: Jan 2018
Posts: 98
Bitmap fade in/out helper tool

I'm not sure if this question belongs here or in the graphics section, but I'll post here. Is there any tool that generates tables for fading in/out bitmaps ? The effect I want to do is to "draw" a bitmap in stripes from top to bottom (Look at the gif bellow, low fps capture, each line shows up each frame)

I'd like to make the colors darker at first, then replace them with the correct ones. Seems easy, on one frame use the bitmap color as an index into a table of the darker version of this color, on the other use the actual color. Is there some tool that helps with colors like that ? I have the worst case of coder colors, I can't make it myself however hard i tried. lol

Thanks ;)
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2018-04-14 14:02

Registered: Oct 2011
Posts: 6
Screen Fade Editor
2018-04-14 14:05

Registered: Oct 2011
Posts: 6
Color Fade Editor
2018-04-14 20:46

Registered: Mar 2005
Posts: 295
The above editors let you edit the delay values for each char ($00-$ff), then you need to generate look up tables per each combination of nibbles, so after a given delay you can update the nibbles based on the previous value, i.e. for color transition $00 > $1d:

$00 > $b6 > $ce > $ f3 > $1d

Check the source of http://csdb.dk/release/download.php?id=119154 to see how it's done (from line 456), feel free to grab my 16k fade tables ;)

It's possible to specify the order of colours that each pixel will get through before it "lands" at its specific colour – i my case I turn all pixels from black $0 to white $0f, and then let them fade to their target values.
2018-04-14 21:28

Registered: Jul 2004
Posts: 164
Fade Maid V1.0

loved to use that one. still requires the source by digger and guys to work on. easy to adapt to own needs and already used by me at times. :)

the tables i created by myself, but i will take a peek at that graph aswell.
2018-04-16 10:23

Registered: May 2004
Posts: 656
For this I used simple table look ups and iirc the code pre-calcs several color rams based on the original one.
2018-04-16 10:40

Registered: Feb 2005
Posts: 145
Colfade doc
2018-04-16 12:12

Registered: Apr 2002
Posts: 4314
I have used censor's ancient old tools for the obviously color cycled shit in Party Groove it was quite usable despite c64 based.
2018-04-16 17:54

Registered: Jan 2018
Posts: 98
Thanks you all. I got more than I asked for. I gotta make nice fadeins now, no excuse haha.
2018-04-17 14:55

Registered: Jan 2018
Posts: 98
I used the colorfade doc by Veto to generate the tables and the tool by Fade Maid to generate the delay values, the fade code and table generator is my own. I think it looks great :) Thanks you all.
2018-04-17 15:22

Registered: Aug 2004
Posts: 867
Oh nice!
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