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Open in GraXpert ​

GraXpert removes gradients and noise and is a common step after stacking. Open in GraXpert hands the image in front to GraXpert and takes the result back as a step of the history: one click there, one click back. You operate GraXpert yourself; Siderea only passes the image and picks up what GraXpert saves.

GraXpert is a separate program with its own license. Siderea does not include it; install it from its own website.

How it works ​

  1. Open the image and choose Image → Open in GraXpert (⌥⌘G), or the Open in GraXpert button under Image in the panel of the Linear, Stretch and Finish steps. Siderea writes the image as a linear 32-bit float FITS file, as it is at this point of the history and without the display stretch, into the exchange folder and starts GraXpert with that file.
  2. The status bar shows Opened in GraXpert, waiting for the result… with Load Result… and Cancel.
  3. In GraXpert, do your work and save the result into the same folder. GraXpert usually names it like the file it was given with _GraXpert added. Any new image file in the folder counts.
  4. When the file is complete, Siderea asks Use the result from GraXpert?. Use Result adds a new history step named GraXpert; Undo and the before/after view work as for any step. Not Now stops the waiting; Load Result… still works.

If GraXpert saves somewhere else or in another name, use Image → Load GraXpert Result… (or Load Result… in the status bar): the file dialog opens in the exchange folder and reads FITS, XISF and TIFF.

What is kept ​

  • The result must have the same size and number of color channels as the image sent. Otherwise Siderea does not take it over and says why.
  • The header and the world coordinates (WCS) of the image sent are kept; only the pixels come from the result. The geometry does not change, so the coordinates stay valid.
  • The GraXpert step is not a module with values. An edit project can store it, but opening such a project stops at that step with a message: GraXpert cannot be run again from Siderea.

Settings ​

Under Settings → Tools you can choose the GraXpert app (by default Siderea looks in /Applications and ~/Applications) and the exchange folder (by default cache/graxpert in the project, without a project a temporary folder). See Settings.

If GraXpert is not found, Siderea says so and offers Choose GraXpert… and a link to the download page.