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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.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'
### `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.
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';
### `write_raw_idat_data`