Create a small PNG whose target pixel at x=2, y=1 stores RGBA 51, 102, 153, 85. Load it, use the 11×11 nearest-neighbor magnifier to put the center marker on that coordinate, then click to lock the point. The result must show zero-based coordinate 2,1 and alpha byte 85; choosing a neighboring transparent or opaque cell must produce a visibly different record.
Compare exact representations
HEX must be #33669955, RGB must preserve 51, 102 and 153, and the alpha-aware CSS output must be rgba(51, 102, 153, 0.333). HSL rounds to 210°, 50% saturation and 40% lightness while retaining the same 0.333 alpha in hsla. Copy each value and compare the clipboard text with the visible field; no file name, coordinate or color value should appear in a network request or analytics event.
Keep alpha separate from the background
The swatch may appear over a checkerboard, but PixelPick does not replace the decoded RGB channels with their composite over that checkerboard. #33669955 remains the decoded pixel. A white page and a dark component will display different final colors from the same semitransparent source, so test the copied rgba or hsla value over the actual target background before shipping the design.
Know what the value describes
PixelPick reports the RGBA bytes produced after this browser decodes the file into Canvas. Embedded profiles, browser conversion and display characteristics can make those bytes differ from another workflow. Use the result for ordinary digital design inspection, then verify important brand or production colors in their authoritative source. It is not calibrated colorimetry, physical paint matching, medical interpretation, accessibility certification or a safety measurement.