Png IDAT how to determine filter type?

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gd1xza2021-05-29 12:26:19

PNG

gd1xza, 2021-05-29 12:26:19

this picture is 3x3

here is the decompressed zlib idat data the desired color appears only 1 time from 2 to 4 bytes
where is the filter announcement?

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