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I took a photo of some vegetable powders in small glasses. Now I would like to change the white color to blue or any other color (maybe gradient), so the color of the powders doesn't change (of course... :P) and the new background color would also be noticable on/through glasses.

Is it possible, to make it look really realistic?

Powder photo.

Image will be used for a product sale web banner.

Thank you guys in advance!

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    Why do you want to change the background color? I think the white really compliments the rainbow shades. – Summer Oct 14 '16 at 12:30
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    Whatever color you choose will have an effect on the perception of the powder colors. The most neutral choices would be black/white or perhaps shades of neutral grey (% pure black). – Luciano Oct 14 '16 at 13:35
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The most safe way would be avoiding color by manually creating a mask on the powders, either by some color selection or by manually painting the mask. by isolating color information, you will end up transforming the powder in a full-black shape that can be cancelled out as a mask. You can do this via selective color or using the selection by color range at the Image > Calculations menu item.

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You can easily change the cast of the background using an adjustment layer. First select the white area and include the clear bowls. Select inverse to mask the spices. I used Selective Color (select Neutrals or Whites) and Channel Mixer each alone changes it slightly different. Play around with the settings until you get the desired effect.

I do not necessarily think these are improvements to the white but it does what you asked. Good luck.

Selective Color

Channel Mixer

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