Method Image.PNM.encode_P4()

Method encode
Method encode_binary
Method encode_ascii
Method encode_P1
Method encode_P2
Method encode_P3
Method encode_P4
Method encode_P5
Method encode_P6

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