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 immediately 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 consideration.
For a complete description, see
/usr/share/doc/openimageio-doc/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),
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).