convert .fig to .jpg based on the ROI

Hi Sir, can I know how to save the .fig from matlab window to .jpg based on the desired result.this the image that I mentioned: http://www.flickr.com/photos/80166922@N06/7347715732/in/photostream

As u can see from the image, there is white area in the backgeound but I do not want the white are.Just want the region of interest (I mean the circular sign only). how should I eliminate the white background so that I can save it as .jpg for the ROI only. FYI, I save the image from .fig to .jpg in my current directory

Answer 1

[Oliver Woodford]

Export_fig automatically crops whitespace around figures by default. Download the files to somewhere on your MATLAB path, then, with the relevant figure open, call:

export_fig specific_directory/test.jpg -a1

[Tulips]

sir,cud u pls explain which part shud I used.I simply dont understand which coding shud I read and used it in my coding.many thanks!!:)

[Oliver Woodford]

Answer updated.

[Tulips]

yeah its exactly works.however, before I export the fig.my resize image is 40x40..after using export_fig test.png the dimension turns to be 41x41. why it that...it supposed to 40x40 same to the resize image, isn't it?

[Tulips]

sir, can I know after done export_fig, then how could I save that image in specific directory?

[Oliver Woodford]

If you have an actual image then cropping it by saving the figure is not the way to go. Why don't you crop the actual image data you're plotting?

[Tulips]

because the image is process, it is basically has complicated background.the above link(the image is the ROI).after do some pre-processing processes, I want to eliminate the whitespace background!

[Image Analyst]

Use any() and find() to find the top and bottom rows, and the left and right columns. Then crop and save with imwrite().

[Tulips]

can u give the code?cant understand.for example after I do [x,y]=find(image). then what shud I do..tq

[Oliver Woodford]

See my updated answer.

[Tulips]

what's the meaning of -a1