SnoopX

A pixel inspector for macOS with HDR support

SnoopX captures raw pixel R, G, B values, and reports their values for the pixel under the red square — 8-bit integers when in SDR mode, 16-bit floats when in HDR mode — at the bottom of the window.

Magnification

1 2 4 8 0

Set magnification to 1x, 2x, 4x, 8x, or 16x.

Capture Control

`k`	Freeze or unfreeze the capture location.
`u`	Update the capture once (while frozen).

The window can be expanded or shrunk by grabbing its edges or corners. If you want to simultaneously inspect two locations, make a copy of the app. Near the edge of the screen, a checkerboard indicates pixels beyond the screen.

SDR and HDR Display

`⌃A`	Auto — choose Standard Dynamic Range (SDR) or High Dynamic Range (HDR) based on display capability.
`⌃S`	SDR — pixel values reported in the range 0–255.
`⌃H`	HDR — pixel values reported in f/stops, where 1.0 = 256, as in Adobe Lightroom.

EDR Rendering

`⌃G`	Gamma — matches what you see on screen, but clamps to the display’s dynamic range.
`⌃L`	Linear — can display any dynamic range, but washes out colors.

Plots and Statistics

`h`	Horizontal plot of pixel values along the indicator row.
`v`	Vertical plot of pixel values along the indicator column.
`o`	Turn off plots.
`l`	Show or hide the indicator line marking the plotted row or column.
`i`	Show or hide statistics (min, max, mean, median) for all pixels in the window.
`s`	Display a swatch of the snooped color.

Plot ordinates follow the display mode: 0–255 for SDR, f/stops for HDR.