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bitbank2 / AnimatedGIF

An optimized GIF decoder suitable for microcontrollers and PCs
Apache License 2.0
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Image edges are jagged on esp8266 #48

Closed ifengchao closed 2 years ago

ifengchao commented 2 years ago

Hi Larry, i was able to play gifs stored with littlefs in nor flash. But i found most gif images edges are jagged, especially image edges with small lines. https://youtu.be/CwPEhcc7Wx0

I've tried diffrent TFT_eSPI settings, but can't help. I wonder if it's limits on esp8266, or i need do some settings with AnimatedGIF library, or something limited by the sreen?

I've tested jpg and bmp images display with no such obvious problem.

Board: esp8266 Screen: st7789 spi screen Tested gif soure image: sun2

Thanks Larry.

bitbank2 commented 2 years ago

Have a look at this video I took of a ST7789 240x240 LCD playing your GIF file. The animation looks relatively smooth, but there are limitations due to the color palette. SPI LCDs are typically 16-bits per pixel (RGB565). Depending on the color choices, 5 bits of red and blue can look grainy and edges which use anti-aliasing can look jagged. This is not a problem of the software, but of reducing a RGB888 palette to RGB565.

https://youtu.be/b19EahUKJk8

ifengchao commented 2 years ago

Your video looks quite good! Finally found that i misunderstood the ENDIAN settings in gif.begin() with the CPU's endian(esp8266 is little endian). Now i started with gif.begin(GIF_PALETTE_RGB565_BE), all works great !!! Thanks again Larry.

bitbank2 commented 2 years ago

Yes, using the wrong endianness would make the pixels look quite strange :)