Extracted from Pike v7.8 release 866 at 2016-11-06.
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Image
Image.PNM

Method Image.PNM.encode_binary()


Method encode_binary

string encode(object image)
string encode_binary(object image)
string encode_ascii(object image)
string encode_P1(object image)
string encode_P2(object image)
string encode_P3(object image)
string encode_P4(object image)
string encode_P5(object image)
string encode_P6(object image)

Description

Make a complete PNM file from an image.

encode_binary () and encode_ascii () uses the most optimized encoding for this image (bitmap, grey or truecolor) - P4, P5 or P6 respective P1, P2 or P3.

encode_P1 /encode_P4 assumes the image is black and white. Use Image.Image->threshold () or something like Image.Colortable ( ({({0,0,0}),({255,255,255})}) )
->floyd_steinberg()
->map(my_image)
to get a black and white image.

encode_P2 /encode_P5 assumes the image is greyscale. Use Image.Image->grey () to get a greyscale image.

Returns

the encoded image as a string

Note

encode () is equal to encode_binary (), but may change in a future release.

See also

decode