Here's a quick trick to get that even white or black background. It can be tough trying to shoot an object and get an even white or black background. Here's what I do to isolate an image. Using the Info Tool (F8) and Curves Adjustment layer helps me identify where I need to paint out areas that need it.Click here for the quick video tip
Below is a summary of steps from the video above.
1.) Use the Info Tool to get an RGB reading (Window > Info)
2.) White in RGB is (255, 255, 255) & Black in RGB is (0, 0, 0)
3.) Duplicate the original layer (Command + J)
4.) Add the Curves Adjustment (Window > Adjustments > Curves)
5.) In the Curves Adjustment drag the black triangle to the right (for black background, drag the white triangle to the left)
Use the Brush Tool (B) and set the Opacity to around 30-40%
6.) Set the foreground color to either white or black depending on which background color you want
7.) Paint on the Duplicate layer
8.) Use the Info Tool (F8) or the Curves Adjustment to aid in getting even white/black background
Hope this helps. Enjoy!
II, Canon 100mm f/2.8L Macro...