Home
JAQForum Ver 24.01
Log In or Join  
Active Topics
Local Time 23:32 22 Nov 2025 Privacy Policy
Jump to

Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.

Forum Index : Microcontroller and PC projects : PicoMite: Bug in LOAD JPG or "user incompetence" ?

Author Message
thwill

Guru

Joined: 16/09/2019
Location: United Kingdom
Posts: 4327
Posted: 03:33pm 19 Nov 2023
Copy link to clipboard 
Print this post

I'm trying to show a JPG on the PicoMite:

Cls
Load Jpg "splash.jpg


splash.zip

And the result is even less satisfactory than the photo :



???

Best wishes,

Tom
MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures
 
Martin H.

Guru

Joined: 04/06/2022
Location: Germany
Posts: 1305
Posted: 04:35pm 19 Nov 2023
Copy link to clipboard 
Print this post

same result,
even  if I copied it to a 320x240 Picture ...
As long as it is jpg, picture looks terrible,
but BMP works as expected
Edited 2023-11-20 02:46 by Martin H.
'no comment
 
phil99

Guru

Joined: 11/02/2018
Location: Australia
Posts: 2837
Posted: 08:54pm 19 Nov 2023
Copy link to clipboard 
Print this post

Results vary depending on the image editor. Got best result with IrfanView but still a narrow strip moved from RHS to LHS.
It seems there are different ways to encode a JPG but this decoder can't cope with them all.

A work-around would be to first reverse-butcher the image so the decoder restores it.  ;)

Or use Blit to rearrange it.
Edited 2023-11-20 06:56 by phil99
 
matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 10637
Posted: 09:15pm 19 Nov 2023
Copy link to clipboard 
Print this post

There is a bug I introduced in the jpg decoder when I got rid of a bunch of compilation warnings. In addition, sorting this led me to another day 1 bug when the image isn't either bigger than the screen or an exact multiple of 8 or 16 pixels wide.

Finally, the splash image is crap with varying pixel levels in the flat colour areas which result in a spotty image - that one isn't my fault.

My bugs will be fixed in RC20 when posted.
 
thwill

Guru

Joined: 16/09/2019
Location: United Kingdom
Posts: 4327
Posted: 10:22am 20 Nov 2023
Copy link to clipboard 
Print this post

  matherp said  There is a bug I introduced in the jpg decoder when I got rid of a bunch of compilation warnings. In addition, sorting this led me to another day 1 bug when the image isn't either bigger than the screen or an exact multiple of 8 or 16 pixels wide.


Thank you Peter, hopefully I'll have a chance to try RC20 out this evening.

  matherp said  Finally, the splash image is crap with varying pixel levels in the flat colour areas which result in a spotty image - that one isn't my fault.


Thanks for pointing this out. Assuming it was "good" when initially generated as a BMP on a CMM2 it is probably the result of having been through too many image transformations as I tried to find a .jpg that worked. I'll start again from scratch.

Best wishes,

Tom
MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures
 
Print this page


To reply to this topic, you need to log in.

The Back Shed's forum code is written, and hosted, in Australia.
© JAQ Software 2025