Flash stream example producing messed color results

[sandric]

I'm new to pico and failing to understand why I'm getting messed up image rendering with flash_stream example in scanline directory. Steps to reproduce screenshots I get:

1. run ./pack.sh in img directory - it will produce 3 bin files and cat them into one pack.bin
2. run sudo picotool load pack.bin -o 1003c000 to upload pack.bin into pico. The original command uses uf2conv -f pico -b 0x1003c000 pack.bin -o pack.uf2 - but I don't know what uf2conv is and where to find it, so as this person on raspberry forum, and I took his suggested command with picotool - uf2conv thread
3. build flash_stream.uf2 and drag it into pico folder with file manager

Having done those I see such strange result, I know little about image processing and what exactly wrong with those:

I tried this on two different monitors, one big 24 inch monitor, and one small 7 inch 40 pin ttl monitor through the scaler - the result is equal.

Running demo1 example with floating raspberry on a blue background works without any issue, so I doubt its a wiring problem.

I also tried to change packing command a bit - e.g. changing format and removing d in ./packtiles -sdf bgar5515 Voss_by_fortuneblues.png voss.bin , it changes some things but colors are still messed.

[barbiani]

Have a look at #32

Also be sure that your image file has the exact resolution.

[sandric]

@barbiani I tried applying this pr after I saw it - it didn't change anything. As for resolution of images, I have 2 screens as I said - one is small 7'', and I believe its maximum resolution is 1024x600, which is not exist as replacement for #define VGA_MODE vga_mode_640x480_60 line. There is closer vga_mode_tft_800x480_50 mode - but I got the same compilation issue as described here. I tried to prevail the same aspect ratio by making images 640x375 pixels - but they just appeared cut, but same bug with wrong colors prevailed.

So I'm not sure what should I do at this point.

[barbiani]

Make the image size exactly 640x480.

…

On Thu, Dec 8, 2022, 11:38 sandric ***@***.***> wrote: @barbiani <https://github.com/barbiani> I tried applying this pr after I saw it - it didn't change anything. As for resolution of images, I have 2 screens as I said - one is small 7'', and I believe its maximum resolution is 1024x600, which is not exist as replacement for #define VGA_MODE vga_mode_640x480_60 line. There is closer vga_mode_tft_800x480_50 mode - but I got the same compilation issue as described here <#30>. I tried to prevail the same aspect ratio by making images 640x375 pixels - but they just appeared cut, but same bug with wrong colors prevailed. So I'm not sure what should I do at this point. — Reply to this email directly, view it on GitHub <#34 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABYLTJGFEEWG6OFIBNN4463WMHXHPANCNFSM6AAAAAASRCWHLE> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[sandric]

@barbiani all images in flash_stream/img folder already 640x480 - https://github.com/raspberrypi/pico-playground/blob/master/scanvideo/flash_stream/img/Lighthouse_at_sunrise_by_Frenchie_Smalls.png

[sandric]

Ok, I finally found the error - I simply connected all DAC resistors upside down, so that 500 Ohm was gpio0, etc.. Sorry, issue resolved.