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41 lines
1.1 KiB
41 lines
1.1 KiB
function saveasppm(x, filename, K)
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%saveasppm encodes an image as PPM and saves it to the disk
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% Usage saveasppm(x, filename, K), where:
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% Inputs
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% - x is the input image
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% - filename is the path and filename of the file where the resulting
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% PPM image is going to be saved
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% - K is the maximum value of brightness
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file = fopen(filename, 'w');
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fwrite(file, 'P6');
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fwrite(file, ' ');
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fwrite(file, int2str(size(x.red, 1)));
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fwrite(file, ' ');
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fwrite(file, int2str(size(x.red, 2)));
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fwrite(file, ' ');
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fwrite(file, int2str(K));
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fwrite(file, newline);
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if K < 256
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precision = 'integer*1';
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precisionBytes = 1;
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machinefmt = 'l';
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else
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precision = 'integer*2';
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precisionBytes = 2;
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machinefmt = 'b';
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end
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for row = 1:size(x.red, 1)
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for column = 1:size(x.red, 2)
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fwrite(file, x.blue(row, column), precision, machinefmt);
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fwrite(file, x.green(row, column), precision, machinefmt);
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fwrite(file, x.red(row, column), precision, machinefmt);
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end
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end
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fclose(file);
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end
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