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Small readme changes

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Niles Rogoff 2017-04-22 01:52:41 -04:00
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@ -48,7 +48,7 @@ This takes an index of a chunk (see below) and overwrites the crc in that chunk
img.color_type = libpme.color_types.RGB img.color_type = libpme.color_types.RGB
img.width = img.height = 1 img.width = img.height = 1
img.chunks[1][2] = b'\x00\xFF\x00\x00' # a 1x1 red image, assuming that the second chunk is the only IDAT chunk img.chunks[1][2] = img.compress(b'\x00\xFF\x00\x00') # a 1x1 red image, assuming that the second chunk is the only IDAT chunk
img.recalculate_crc(1) # img.chunks[1][3] is now set to b'T\xbb\xd3\xea' img.recalculate_crc(1) # img.chunks[1][3] is now set to b'T\xbb\xd3\xea'
### `recalculate_length` ### `recalculate_length`
@ -69,7 +69,7 @@ This saves the image to the disk, overwriting a file if it was already there. If
Concatenates the (still compressed) data of each IDAT chunk, then returns it. Concatenates the (still compressed) data of each IDAT chunk, then returns it.
img.width = 2 img.width = 2
img.chunks.insert(2, [b'\x00\x00\x00\x03', b'IDAT', img.compress(b'\x00\xFF\x00'), b'j\xee\xb3\xd0']) # making it a 2x1 image with a red and a green pixel img.chunks.insert(2, [b'\x00\x00\x00\x03', b'IDAT', img.compress(b'\x00\xFF\x00'), b'j\xee\xb3\xd0']) # reusing the old data, now it's a 2x1 image with a red and a green pixel
img.decompress(img.get_concatenated_idat_data()) # returns '\x00\xFF\x00\x00\x00\xFF\x00'; img.decompress(img.get_concatenated_idat_data()) # returns '\x00\xFF\x00\x00\x00\xFF\x00';
### `write_raw_idat_data` ### `write_raw_idat_data`