So, I went back into playing with adafruit's Neomatrix,

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So, I went back into playing with adafruit’s Neomatrix, and there are a few problems I’d like your opinion on:

  1. Any bitmap that contains black (like linux penguin), does not look good because black is not really back. Actually you can see the eyes better in the picture than when looking with your own eyes. I’m not sure there is a great solution to this outside of only using bitmaps that have non black colors. Is that what you found too?

  2. so far I’ve been looking for 32 pixel icons on the internet, I then convert them from png to 100% quality jpeg and then to a .h file:
    %.c: %.jpg
    convert565 /c $?

%.jpg: %.png
convert -quality 100 -fill ‘#00000000’ -opaque none $? $?.jpg

Have you found other/better ways to do this?
Thanks

cbf89f4bb476707d32d864bbf6eaa4c0.jpeg
cbf89f4bb476707d32d864bbf6eaa4c0.jpeg2560×2093 1.5 MB

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this is an example with white background, which did not work well either, and sucked a lot of power of course :slight_smile:
missing/deleted image from Google+

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A colored logo with less white and no black, works better (doesn’t look fantastic due to the picture, but looked ok with the human eye)
missing/deleted image from Google+

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Tried a smoke plastic cover?

5

@Martin_Espinoza no, not yet. I know it gives nicer results, but not sure it will fix my black issue, although maybe it might?

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It will definitely make the blacks blacker.

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Yes, a neutral gray tinted acrylic sheet or a clear piece with some window tint will add a lot of contrast.

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Thanks all, I’ll try that

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@Marc_MERLIN when displaying bmp files on my leds table I apply a gamma transformation. http://learn.adafruit.com - The Issue | LED Tricks: Gamma Correction | Adafruit Learning System i use this on my ws2812. I have a formula that takes also into account the brightaness. I could see a great difference especially when coming to pictures. PS I also put some on top of a light background usually (10,10,10) if you have transparency

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@Yves_BAZIN I think you tried to link to https://learn.adafruit.com/led-tricks-gamma-correction/the-quick-fix and G+ broke it, but I found the page, thank you.

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@Marc_MERLIN yes indeed that is the link I wanted to post. Thank you