op.metric() does not work

I am trying to compare 2 images and get the PSNR metric. When I use op.metric(\"PSNR\") it  does not return anything.
I am using ArrayListOutputConsumer to capture the output.
It works fine for op.verbose(),

Did you connect your ArrayListOutputConsumer with setErrorConsumer()? ImageMagick writes the metric-output to stderr, not to stdout. For an example, TestCase24.java in src/org/im4java/test.

Bernhard

In fact, ArrayListOutputConsumer does not implement consumeError(). In the next version I will add a class ArrayListErrorConsumer. I hope I will find some time after Christmas to implement this and a few other additions, so you should have a working version beginning of next year.

Bernhard

How could i get access to TestCase24.java in src/org/im4java/test, could you send me the url.

Thanks

I tried to cmd.setErrorConsumer(output) where output is an instance of ArrayListOutputConsumer, but that did not work

Hi niki,
Did this work for you? I am trying to achieve something similar and having same issue as you.

Thanks,
PShah

Hi,

please have a look at src/org/im4java/test/TestCase24.java. The file is in the source-distribution. You have to define an ArrayListErrorConsumer and use CompareCommand.setErrorConsumer(...).

Bernhard

I did this .. But I am not able to get value of compare. Basically, I want to get the metric value into a variable before proceeding further.

CompareCmd compare = new CompareCmd();
ArrayListErrorConsumer arryListCon = new ArrayListErrorConsumer();
compare.setErrorConsumer(arryListCon);

MOperation cmpOp = new IMOperation();
cmpOp.addImage();
cmpOp.addImage();
cmpOp.metric("AE");
cmpOp.addImage();

compare.run(cmpOp, getScreenshotDir+ "/MIFF-"+nonBaseImg,
getScreenshotDir+ "/MIFF-"+baseImg,
getScreenshotDir+ "/MIFF-"+nonBaseImg+"__diff");

ArrayList<string> cmdOP = arryListCon.getOutput();</string>

for (String line : cmdOP) {
log.info("----------> "+line);
}