That's nice. I already figured it out myself, all the information you need to decode 1026 can be found here
As for formats 1-1 and 1-2, they both are ARGB 4-bits per channel, just like format 1-0. The only problem is that to get the real image, you need to divide by 1/2 the width and height (format 1-1) and by 1/4 (format 1-2). A regular upscaling does not produce the same results like the images from GMS, so I really don't know what interpolation technique they are using in these formats.
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.As for formats 1-1 and 1-2, they both are ARGB 4-bits per channel, just like format 1-0. The only problem is that to get the real image, you need to divide by 1/2 the width and height (format 1-1) and by 1/4 (format 1-2). A regular upscaling does not produce the same results like the images from GMS, so I really don't know what interpolation technique they are using in these formats.