CODEWITHSUNDEEP
javaopencvimage-processingrgbbgr
Amrmsmb
Amrmsmb

Reputation: 1

How can I know if the image is in RGB or BGR format?

Is there any way to know in advance if an image used as an input to a system is in RGB or BGR format?

I am using OpenCV with java API and I would like to convert an input image into grayscale or L*a*b* color space, but in OpenCV you have to specify first whether the image you want to convert is in RGB or BGR.

The type of the image I am using is either .jpg or .png.

Upvotes: 21

Views: 42559

Answers (3)

SherylHohman
SherylHohman

Reputation: 17900

If you are reading in the image file, or you have access to the code that reads in the file, know it is:

  • BGR order if you used cv2.imread()
  • RGB order if you used mpimg.imread() (assuming import matplotlib.image as mpimg)

If you don't know how the file was opened, the accepted answer BufferedImage is great for Java.
I would like to find a way to do the same in Python!

Upvotes: 27

Alexander Leon VI
Alexander Leon VI

Reputation: 509

When you use opencv (imread, VideoCapture), the images are loaded in the BGR color space.

Upvotes: 10

Jean-Baptiste Yunès
Jean-Baptiste Yunès

Reputation: 36391

If your image is a BufferedImage then you can ask for his type with getType(), and test against the several constants (see: BufferedImage).

Upvotes: 2

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