NAME

idiff -- compare two images

SYNOPSIS

Usage: idiff [options] <image1> <image2 | directory>

DESCRIPTION

This program is part of the OpenImageIO (http://www.openimageio.org) tool suite. Detailed documentation is available in pdf format with the OpenImageIO distribution.

OPTIONS

--help: Print help message
--version: Print version and exit
-v: Verbose status messages
-q: Quiet (minimal messages)
-a: Compare all subimages/miplevels

Thresholding and comparison options

-fail VAL: Failure absolute difference threshold (default: 1e-06)
-failrelative VAL: Failure relative threshold (default: 0)
-failpercent PERCENT: Allow this percentage of failures (default: 0)
-hardfail VAL: Fail if any one pixel exceeds this error (default: inf)
-allowfailures N: OK for this number of pixels to fail by any amount (default: 0)
-warn VAL: Warning absolute difference threshold (default: 1e-06)
-warnrelative VAL: Warning relative threshold (default: 0)
-warnpercent PERCENT: Allow this percentage of warnings (default: 0)
-hardwarn VAL: Warn if any one pixel exceeds this error (default: inf)
-p: Perform perceptual (rather than numeric) comparison

Difference image options

-o FILENAME: Output difference image
-od: Output image only if nonzero difference
-abs: Output image of absolute value, not signed difference
-scale FACTOR: Scale the output image by this factor (default: 1)