How to extract blood vessels of the background image of eye?

We need extract the blood vessels of a set of background images of eye. We tried the magnetic lasso tool and the quick selection tool, but that doesn't give a very good accuracy and is very long. We have tried to select by color range ships, but that does not work either. We want results like the image. Is it possible to do a relatively good without going through the trouble of tracing along the vessels accurately?

Query.PNG

Once replicate you my original result, you can increase the contrast with:

1 trick image, multiply the value

2 brush gently and selectively with the Mode set to overlay

3 fool the image, creating a slightly darker version (end of shadow of the scale through curves) and then retrieve only this darker part of the scale using the mixture if control and not affecting is not the end of the highest point of the scale.

It will produce a result similar to this:

Good luck.

Tags: Photoshop

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