[Coco] CoCo 3 Projector 3 Blues: The program only gives errorsto drive numbers higher than 1 (reposted because ofpossible size violation of previous message)

[Roger Taylor]

At 09:26 PM 1/16/2010, you wrote:
>Robert Gault wrote:
>>RJLCyberPunk wrote:
>>>the Run"boot" method but is OK I've fixed it now with the added
>>>code,still the program does give you a save feature but does it save the
>>>files in a format that can then be read in a standard fashion from Disk
>>>Basic? It has been a while since I've done any programming on the CoCo
>>>Emulated or not so if it does can you or someone provide the listing of
>>>the program needed to load a "standard" picture file into memory?
>>
>>Projector-3 is a perfect example of a program that can load a 
>>"standard" picture into memory. There is no standard format for 
>>Coco images although many users have created their own. Then there 
>>are graphic programs such as The RAT and CocoMax-III which have 
>>their own Coco image formats.
>>Perhaps what you mean is a Coco program to dump either a PMODE or 
>>HSCREEN to disk along with the palette colors. Well the OS-9 vef 
>>format is the same as an HSCREEN and I think Projector-3 will save 
>>files in the vef format. In fact, given a vef file in NTSC artifact 
>>format, Projector-3 should display it just fine.
>
>I can confirm that P-3 does display these 256-color VEF 
>pictures.  Of course, these are simply 640x200 4-color pictures in 
>disguise.  When I get a little more time, I'll upload the pics from 
>my slideshow in DECB disk images for those who want to view them in 
>The Projector.
>
>Now what would be cool (and probably what Roger had in mind) would 
>be a module for P-3 that would take an 8-bit .GIF or .BMP picture, 
>scale it to 160x200, and render it to the screen in 256 artifact 
>colors.  This would be significantly more complicated than just 
>displaying a picture that has already been converted but should 
>certainly be possible.  In addition to scaling the image, it would 
>have to remap the original image's palette to the nearest colors in 
>the CoCo's fixed palette of artifact colors -- probably from a 
>look-up table.  I guess the existing dithering options could be 
>used, though I'm not entirely clear how that would work with artifact colors...
>
>JCE


Exactly.  Check out the source code files I attached earlier or load 
up the P-3 project in the Rainbow IDE and see how easy it can be to 
do stuff like this.

For these artifacted ~256 color pictures, you would simply turn off 
dithering in P-3 when loading the pics.

-- 
~ Roger Taylor