How to check if a pixel is 100% transparent (transparency level)

adobe-photoshopgimp

I have an image where a certain region must be 100% transparent. However, another tool reports that not all pixels are completely transparent.

How can I check if a certain pixes is completely transparent or 99% only?

PS. I am creating a nine-patch image and it seems that a shadow is overlapping to the marginal 1px line and I can't figure out where. I cannot add another 1px to height/width, I just need to know how to check transparency level

EDIT

It seems that color picker tool in Gimp can show alpha values as well, but I cannot find where it shows these alpha values. all I see are x and y coordinates. Look at the image

Best Answer

Use the color picker tool. Either

  • check the alpha level on the color wheel (or whatever you use), or
  • Shift-click the image - this will open an information window which shows RGB and alpha values

The information window will stay open even if you click without Shift afterwards. Just close it when you don't need it anymore.

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