Remove colour background from transparent object?

[ChrisPearson100]

As per the image.  I want to remove the blue dackground from the transparent object.  I've tried selecting and masking by colour range, but the shadows and highlights are causing issues.

[jane-e]

@ChrisPearson100 

Use the Pen tool set to Path mode to draw a path around the shape, then create a Layer mask to hide what you don't want.

Jane

[ChrisPearson100]

Thanks for the reply.  I should have been a bit clearer.  I want to remove the colour from 'behind' the transparent object, not just from around the object.

[c.pfaffenbichler]

The Green Channel seems to provide the best overll detail, so you could use that (and Curves) to isolate »black« and »white« from the image with Blend If-settings and Color Overlays.

 

[Trevor.Dennis]

It's a tricky one because the image quality is so poor, but you make a clipping path exactly as Jane said, and then desaturated to remove the blue.  The glass object is also very dark other than its few highlights, you'd use either/or curves and the Camera RAW filter to retrieve the contrast after brightening the dark tones.

It can be useful having an example to compare with but it would be a tall order to make the blue object look like the glass below.