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I have an image that has alpha channel transparency.
I want to recreate the same background color with RGBA values in CSS but I can not find the real color of the background pixels and their alpha channel value. if I use any sort of color picker it will give me the absolute value of the pixel color which is relevant to its background color.
Do you know any trick to find out the real alpha channel value of a pixel?
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To check if the image has an alpha channel, go to the channel dialog and verify that an entry for “Alpha” exists, besides Red, Green and Blue. If this is not the case, add a new alpha channel from the layers menu; Layer+Transparency → Add Alpha Channel.
PNG does not support alpha channels, only alpha transparency when you save it as PNG24. If you need to have Alpha channels in Photoshop you have to save as PSD.
An alpha channel, representing transparency information on a per-pixel basis, can be included in grayscale and truecolor PNG images. An alpha value of zero represents full transparency, and a value of (2^bitdepth)-1 represents a fully opaque pixel.
PNG files support transparency, but JPGs do not. If you save a PNG image as a JPG file, the JPG format doesn't know what to do with the alpha channel. That's why all the transparency turns into an opaque white background instead.
In Photoshop's Info panel, you can choose 'Opacity' as a readout mode, though it will show up as a percentage and not as a real alpha value.
To enable it, simply open the Info window, choose Panel Options and then set the Second Color Readout mode to Opacity.
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