Histogram & Contrast
SXM Viewer includes histogram-based range controls for adjusting image contrast without changing the underlying data.
Opening the histogram tool
Use the image display controls or the relevant right-click menu entry to open the histogram/range dialog for the current preview or pop-out.
The histogram tool has been split into its own controller internally, but from the user side it remains part of the normal image-adjustment workflow.
What you can do
Typical histogram tasks include:
- inspecting the data-value distribution for the current view
- adjusting the active display range
- resetting contrast after experimental changes
- refining the view before export or screenshot capture
Interaction with other tools
Histogram edits are display operations, not destructive processing. They work alongside:
- relative-zero display
- colorbar orientation and display settings
- profiles and overlays
- popup-specific view state
Recent fixes explicitly prevented histogram interactions from creating or updating profiles when profile mode is not active.
Auto-contrast behavior
The project history shows special handling for partial scans and invalid regions during auto-contrast. In practice, that means the contrast logic tries to ignore obvious invalid rows rather than letting them dominate the visible range.
Tips
Tip
If an image looks washed out, first try the histogram/range dialog before applying a filter.
Tip
For constant-height images, test histogram changes together with 0 relative-zero mode, since that can produce a more interpretable zero-anchored colorbar.