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idiff(1) [redhat man page]

IDIFF(1)                                                      General Commands Manual                                                     IDIFF(1)

NAME
idiff - compare two images SYNOPSIS
idiff [options] image1 image2 DESCRIPTION
The idiff utility is invoked as follows: idiff [options] image1 image2 Where input1 and input2 are the names of two image files that should be compared. They may be of any format recognized by OpenImageIO (i.e., for which image-reading plugins are available). If the two input images are not the same resolutions, or do not have the same number of channels, the comparison will return FAILURE imme- diately and will not attempt to compare the pixels of the two images. If they are the same dimensions, the pixels of the two images will be compared, and a report will be printed including the mean and maximum error, how many pixels were above the warning and failure thresholds, and whether the result is PASS, WARNING, or FAILURE. For example: $ idiff a.jpg b.jpg Comparing "a.jpg" and "b.jpg" Mean error = 0.00450079 RMS error = 0.00764215 Peak SNR = 42.3357 Max error = 0.254902 @ (700, 222, B) 574062 pixels (82.1%) over 1e-06 574062 pixels (82.1%) over 1e-06 FAILURE The "mean error" is the average difference (per channel, per pixel). The "max error" is the largest difference in any pixel channel, and will point out on which pixel and channel it was found. It will also give a count of how many pixels were above the warning and failure thresholds. The metadata of the two images (e.g., the comments) are not currently compared; only differences in pixel values are taken into considera- tion. For a complete description, see /usr/share/doc/libopenimageio-dev/openimageio.pdf.gz. OPTIONS
--help Print help message -v Verbose status messages -a Compare all subimages/miplevels Thresholding and comparison options -fail %g Failure threshold difference (0.000001) -failpercent %g Allow this percentage of failures (0) -hardfail %g Fail if any one pixel exceeds this error (infinity) -warn %g Warning threshold difference (0.00001) -warnpercent %g Allow this percentage of warnings (0) -hardwarn %g Warn if any one pixel exceeds this error (infinity) -p Perform perceptual (rather than numeric) comparison Difference image options -o %s Output difference image -od Output image only if nonzero difference -abs Output image of absolute value, not signed difference -scale %g Scale the output image by this factor SEE ALSO
iconvert(1), igrep(1), iinfo(1), iprocess(1), iv(1), maketx(1), oiiotool(1). AUTHOR
OpenImageIO was written by Larry Gritz and the other authors and contributors. This manual page was written by IRIE Shinsuke <irieshinsuke@yahoo.co.jp>, for the Debian project (and may be used by others). May 19, 2012 IDIFF(1)

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OIIOTOOL(1)						      General Commands Manual						       OIIOTOOL(1)

NAME
oiiotool - the OIIO Swiss Army Knife SYNOPSIS
oiiotool [filename|option|action]... DESCRIPTION
The oiiotool program will read images (from any file format for which an ImageInput plugin can be found), perform various operations on them, and write images (in any format for which an ImageOutput plugin can be found). The oiiotool utility is invoked as follows: oiiotool args oiiotool maintains an image stack, with the top image in the stack also called the current image. The stack begins containing no images. oiiotool arguments consist of image names, or commands. When an image name is encountered, that image is pushed on the stack and becomes the new current image. Most other commands either alter the current image (replacing it with the alteration), or in some cases will pull more than one image off the stack (such as the current image and the next item on the stack) and then push a new image. For a complete description, see /usr/share/doc/libopenimageio-dev/openimageio.pdf.gz. OPTIONS
Options (general): --help Print help message -v Verbose status messages -q Quiet mode (turn verbose off) -a Do operations on all subimages/miplevels --info Print resolution and metadata on all inputs --stats Print pixel statistics on all inputs --hash Print SHA-1 hash of each input image --no-clobber Do not overwrite existing files --threads %d Number of threads (default 0 == #cores) Commands that write images: -o %s Output the current image to the named file Options that affect subsequent image output: -d %s Set the output data format to one of: uint8, sint8, uint10, uint12, uint16, sint16, half, float, double --scanline Output scanline images --tile %d %d Output tiled images (tilewidth, tileheight) --compression %s Set the compression method --quality %d Set the compression quality, 1-100 --planarconfig %s Force planarconfig (contig, separate, default) --adjust-time Adjust file times to match DateTime metadata --noautocrop Do not automatically crop images whose formats don't support separate pixel data and full/display windows Options that change current image metadata (but not pixel values): --attrib %s %s Sets metadata attribute (name, value) --sattrib %s %s Sets string metadata attribute (name, value) --caption %s Sets caption (ImageDescription metadata) --keyword %s Add a keyword --clear-keywords Clear all keywords --orientation %d Set the assumed orientation --rotcw Rotate orientation 90 deg clockwise --rotccw Rotate orientation 90 deg counter-clockwise --rot180 Rotate orientation 180 deg --origin %s Set the pixel data window origin (e.g. +20+10) --fullsize %s Set the display window (e.g., 1920x1080, 1024x768+100+0, -20-30) --fullpixels Set the 'full' image range to be the pixel data window Options that affect subsequent actions: --fail %g Failure threshold difference (0.000001) --failpercent %g Allow this percentage of failures in diff (0) --hardfail %g Fail diff if any one pixel exceeds this error (infinity) --warn %g Warning threshold difference (0.00001) --warnpercent %g Allow this percentage of warnings in diff (0) --hardwarn %g Warn if any one pixel difference exceeds this error (infinity) Actions: --create %s %d Create a blank image (args: geom, channels) --pattern %s %s %d Create a patterned image (args: pattern, geom, channels) --unmip Discard all but the top level of a MIPmap --selectmip %d Select just one MIP level (0 = highest res) --subimage %d Select just one subimage --diff Print report on the difference of two images (modified by --fail, --failpercent, --hardfail, --warn, --warnpercent --hardwarn) --add Add two images --sub Subtract two images --abs Take the absolute value of the image pixels --flip Flip the image vertically (top<->bottom) --flop Flop the image horizontally (left<->right) --flipflop Flip and flop the image (180 degree rotation) --crop %s Set pixel data resolution and offset, cropping or padding if necessary (WxH+X+Y or xmin,ymin,xmax,ymax) --croptofull Crop or pad to make pixel data region match the "full" region --resize %s Resize (640x480, 50%) --fixnan %s Fix NaN/Inf values in the image (options: none, black, box3) --pop Throw away the current image --dup Duplicate the current image (push a copy onto the stack) Color management: --iscolorspace %s Set the assumed color space (without altering pixels) --tocolorspace %s Convert the current image's pixels to a named color space --colorconvert %s %s Convert pixels from 'src' to 'dst' color space (without regard to its previous interpretation) Known color spaces: "linear", "sRGB", "Rec709" SEE ALSO
iconvert(1), idiff(1), igrep(1), iinfo(1), iprocess(1), iv(1), maketx(1). AUTHOR
OpenImageIO was written by Larry Gritz and the other authors and contributors. This manual page was written by IRIE Shinsuke <irieshinsuke@yahoo.co.jp>, for the Debian project (and may be used by others). May 19, 2012 OIIOTOOL(1)
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