Convex Hull Produces Black Image

[bob.wolff68]

Yes - when you do the image->Write() function, if you use a .jpg filename, you'll wind up with black images often (or always). If you use .bmp, you'll wind up with usable files/images. And the other person said .png which I haven't personally tried.

.bmp
or
.png

Let us know this solved it.

bob

[ben_benavides]

Thanks for the help. We have successfully applied a convex hull and we are on our way to finishing vision tracking.

[GrimmReaper]

I hadn't tried a BMP or PNG file, but rather just converted the image(changed the contrast and gamma) so that i could see the contrasting pieces and saved that as a JPG, so here's another example for ya, this results in a white on black image:

		Image* thisImage = myBinaryImage->GetImaqImage();
				
		BCGOptions bcg;
		bcg.brightness = 128.0f;
		bcg.contrast = 89.0f;
		bcg.gamma = 0.1f;
		
		if (imaqBCGTransform(thisImage, thisImage, &bcg, NULL) == 0)
		{
			//error during save
			printf("Error with imaqBCGTransform : %d\n", imaqGetLastError());
			return ERROR;
		}
	
		if (imaqWriteFile(thisImage, "/BinaryImage.jpg", NULL) == 0)
		{
			//error during save
			printf("Error saving image : %d\n", imaqGetLastError());
			return ERROR;
		}

- Jon