how can i make this glass full of soda be empty?

danielo33771543

Not an easy fix, but it might be doable.  I'll be working it out as I do this post, so I am not exactly sure what's going to happen.

First you need an empty glass.  I couldn't find the same glass

So I used Free Transform > Warp to get it closer

Then we need a straw, so fill a selection with the straw colour

Fill another selection with the red stripe colour on a new layer, and Free Transform it to match the angle.  Note I have straightened the original straw layer to help with the alignment.

Before you OK the Free Transform (FT) click on the Warp button, and give it a slight Flag twist.  You can turn the Warp off temporarily to get the length about right, then go back into Warp to fine tune.  This step is necessary to get the twist in the right place

I said I was working this out as I did it, and the warp did not work, so I stepped back and made the red stripe layer a Smart Object, and clipped it to the straw stem.  Then went back to FT > Warp the stripe.  This meant I could better see what I was doing, and could go back in a fine tune, because it was a Smart Object.  I've got a bit more twist, but I am going to leave it for now.

I've grouped the straw layers.

Copied the stripe layer several times

And with the Move tool selected, used the alignment tool to distribute the stripes up the straw.

I've filled a selection with black and blurred it

I've clipped it to the straw stem, reduced opacity to 40% and set it to Multiply.

Made a copy and moved to the right side of the stem

Made a white stripe down the center, blurred it and set to Screen

Made the straw group a Smart Object.

Placed it below the glass layer

And set the glass layer to Multiply (this will probably change when we add the liquid)

Nearly there

I've cut out the liquid and ice from the original

Copied to the new glass document.

Made it a Smart Object

And made a clipping path just inside the glass outline.

A few things have happened now, sop I hope you can follow

The primary liquid layer is clipped to the gray layer meaning that's the only bit that shows

There was a bad transition at the edge, so I blurred the gray layer so the liquid would extend outwards into the glass edge.

A copy of the liquid layer was moved up the stack, and masked so it only shows the outside glass bit

Note the glass is still at the top of the stack set to Multiply.

The straw layer is masked below the ice

A copy of the straw is moved up the stack, rotated a bit to mimic refraction

And set to Multiply

I'll just do the half full.  You can work it out for the other two.

The red layers are no longer needed

The green layers have been changed.

The liquid layer just need moving down.  Its mask hides the liquid outside the glass

Both straw layers need changing. The outside was unmasked to the new liquid level

The below liquid was changed to Hard Light and its opacity dropped to 50%

I did say it was not an easy fix.  The clipping masks and gray layer are the important bits.  They help you control what shows and what doesn't, and they provide an easy way of reloading the selections (By Ctrl clicking the work path).  Blend modes are also crucial, but it's OK to toggle through to see what works and what doesn't.  I have a good idea which blend mode I need, but I still use trial and error sometimes. 

Good luck, and enjoy.

This was wonderfully summed up in another thread - I think it was Trevor.Dennis who said it:

It's not an effect. It's a photograph.

Maybe instead of reshooting, look for stock art that includes the various levels like this one Cola collection - Buy this stock photo and explore similar images at Adobe Stock | Adobe Stock Even if you had an empty version of the glass and tried to mask out portions of the full glass, the position and shape of the ice realistically would change as you got to the bottom as would any bubbles inside the glass vs the clean glass, so it would be fairly painstaking to try to recreate that.

It would be easier to reshoot.

that would need to be shot in "sequence" i am afraid. There is nothing to work with it would be remotely possible if the Glass was empty and you had individual shots of the other elements.