Error while changing image bit depth in MATLAB
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I'm trying to convert RGB image with some bit depth to BMP image of bit depth 8. here is my code
a = imread('DSC01684_5.bmp');
[x,map] = rgb2ind(a,32);
imwrite(x,map,'C:\Documents and Settings\Home\Desktop \DSC01684_5.bmp.','bitdepth', 8);
and I'm getting error like
??? Error using ==> imformats>find_in_registry at 507
Format specifier must be a 1-D character array.
Error in ==> imformats at 114
varargout{1} = find_in_registry(fmts, varargin{1});
Error in ==> imwrite>get_format_from_filename at 550
fmt_s = imformats(ext);
Error in ==> imwrite at 389
format = get_format_from_filename(filename);
is the error in imwrite function or in changing bit depth?
However if i use
output_filename = 'C:\Documents and Settings\Home\Desktop\DSC01684_5.bmp.'
imwrite(x, map, output_filename, 'bmp', 'bitdepth', 8);
I'm getting error like
??? Error using ==> imagesci\private\writebmp
Too many input arguments
Error in ==> imwrite at 429
feval(fmt_s.write, data, map, filename, paramPairs{:});
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Jan
am 5 Jun. 2013
Bearbeitet: Jan
am 5 Jun. 2013
The first error is caused by the trailing dot in "DSC01684_5.bmp.", such that omitting it allows to recognize the file type by the extension.
Because RGB2IND replies an UINT8 for 32 colors, you do not have to specify the bitdepth explicitly:
file = 'C:\Documents and Settings\Home\Desktop\DSC01684_5.bmp'
imwrite(x, map, file);
imfinfo(file)
% >> ... BitDepth: 8
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Weitere Antworten (1)
Walter Roberson
am 5 Jun. 2013
'bitdepth' only applies to JPEG and PNG formats. There are no supported options for bmp files.
2 Kommentare
Walter Roberson
am 6 Jun. 2013
imwrite() chooses the depth from the datatype in this situation. It only allows that automatic depth choice to be overridden via the 'bitdepth' option for JPEG and PNG
Siehe auch
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