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Technology
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What format are you saving them in? BMP? Try png.
I am using png. Level 0 compression tho and in 4k (3840*2160), sometimes even 4k + 2*1440p (2560*1440), but it's already too large with just my main 4k monitor.
PNG started out as ZIP(BMP) and hasn't gotten that much better. Use JPEG. The pixels you lose are not worth crying about
Or they could just compression for their PNGs. PNG is a lossless format so they'll only lose a fraction of a second during creation.