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25 .if n .po 0

26 .TH RGB2YCBCR 1 "November 2, 2005" "libtiff"

27 .SH NAME

28 rgb2ycbcr \- convert non-YCbCr

29 .SM TIFF

30 images to a YCbCr

31 .SM TIFF

32 image

33 .SH SYNOPSIS

34 .B rgb2ycbcr

35 [

36 .I options

37 ]

38 .I "src1.tif src2.tif ... dst.tif"

39 .SH DESCRIPTION

40 .I rgb2ycbcr

41 converts

42 .SM RGB

43 color, greyscale, or bi-level

44 .SM TIFF

45 images to YCbCr images by transforming and sampling pixel data. If multiple

46 files are specified on the command line each source file is converted to a

47 separate directory in the destination file.

48 .PP

49 By default, chrominance samples are created by sampling

50 2 by 2 blocks of luminance values; this can be changed with the

51 .B \-h

52 and

53 .B \-v

54 options.

55 Output data are compressed with the

56 .SM PackBits

57 compression scheme, by default; an alternate scheme can be selected with the

58 .B \-c

59 option.

60 By default, output data are compressed in strips with

61 the number of rows in each strip selected so that the

62 size of a strip is never more than 8 kilobytes;

63 the

64 .B \-r

65 option can be used to explicitly set the number of

66 rows per strip.

67 .SH OPTIONS

68 .TP

69 .B \-c

70 Specify a compression scheme to use when writing image data:

71 .B "\-c none"

72 for no compression,

73 .B "\-c packbits"

74 for the PackBits compression algorithm (the default),

75 .B "\-c jpeg"

76 for the JPEG compression algorithm,

77 .B "\-c zip"

78 for the deflate compression algorithm,

79 and

80 .B "\-c lzw"

81 for Lempel-Ziv & Welch.

82 .TP

83 .B \-h

84 Set the horizontal sampling dimension to one of: 1, 2 (default), or 4.

85 .TP

86 .B \-r

87 Write data with a specified number of rows per strip;

88 by default the number of rows/strip is selected so that each strip

89 is approximately 8 kilobytes.

90 .TP

91 .B \-v

92 Set the vertical sampling dimension to one of: 1, 2 (default), or 4.

93 .SH "SEE ALSO"

94 .BR tiffinfo (1),

95 .BR tiffcp (1),

96 .BR libtiff (3)

97 .PP

98 Libtiff library home page:

99 .BR http://www.remotesensing.org/libtiff