You can remove a certain color in Photoshop using the "Selective Color" adjustment layer. Here are the steps to do so:
1.Open the image in Photoshop.
2.Go to the "Layers" panel and click on the "Create new fill or adjustment layer" button at the bottom. Choose "Selective Color" from the drop-down menu.
3.In the "Selective Color" dialog box, choose the color you want to remove from the drop-down menu. For example, if you want to remove the color blue, choose "Blues."
4.Adjust the color sliders until the color you want to remove is completely removed. If you're not sure which sliders to adjust, try the "Cyan," "Magenta," "Yellow," and "Black" sliders first.
5.Click "OK" to apply the changes.
6.If the removal is too extreme or affects parts of the image you don't want to change, you can adjust the opacity of the "Selective Color" layer to fine-tune the effect.
7.If you want to save the image with the color removed, go to the "File" menu and choose "Save As" to save the image in a new file.
That's it! The color you selected should now be removed from the image. Note that this method only works for removing one color at a time. If you want to remove multiple colors, you'll need to repeat the process for each color separately.