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Frequently Asked Questions

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This page compiles some advices coming from mail or forums exchanges.

Lists management

Tips :

  • The "-" button in the tabs frame permits you to delete whole image sequences or individual images.
  • Several movie sequences and/or images may be added to the same list at once.
  • Images or movies can be dragged from the Finder or another application (iPhoto for example) and dropped onto the list frame.

Opening images

When adding raw files, the pictures get loaded into Lynkeos, but when you click on the first picture, Lynkeos freezes... The time until -after a click- the first picture is displayed increases heavily with the number of pics

When a "raw" file, such as a CR2 is loaded, Dcraw is launched in the background to extract RGB data from the file. This processing takes some seconds per file.

When you click in the list panel, Lynkeos needs to wait for Dcraw to finish its work before being able to display the image. When you add 60 files, 60 conversions are started in parallel, and they may take one or two minutes to complete. However, adding several files at once allows to spread the conversions on available cores.

You may be impatient to see your picture displayed, but you have to wait for the conversions to complete Biggrin.gif

Lynkeos does not accept the RAW files from my camera.

Camera manufacturers regularly add new RAW file formats, and it's possible that this format was not included in the latest release. But, do not despair : Lynkeos uses Dcraw ( which may actually include support for that format ; and you can overcome that situation by changing Lynkeos configuration :

  • open the application package ("Show package contents" in the finder),
  • go to the folder Contents/Plugins
  • open the RAW.bundle plugin ("Show package contents" once again),
  • go to the folder Contents/Resources
  • open the file dcraw_file_extensions.plist with "Property List Editor" or any text editor, it is an XML file,
  • add the suffix for your file in the extensions,
  • restart Lynkeos.

If you don't want to dig into configuration files, just put a "raw" suffix to your files (ie: myrawfile.raw) ; but you will have to repeat this for each RAW file.

When I open RAW images, they are too dark.

Lynkeos opens the RAW images without applying any correction (otherwise, it wouldn't be "raw") ; they therefore lack a contrast correction process that is applied by photographic converters. You have to apply that correction after stacking : when you process the final result, use a gamma correction setting of 2.3, and adjust around it to obtain the best display.

When I add a QuickTime movie, Lynkeos does not open it, or open only the first image.

Recent changes in the QuickTime API incurred regression in the Lynkeos Cocoa movie reader. This can be worked around by renaming the ".MOV" file to a ".AVI".
Of course, this should be fixed in a future version.


I bring in the flats and dark..... sum the data sets, at what time do the flats and darks get applied to the light frames ?

As soon as the dark frames and flat fields are stacked, they are applied during each light frame process : aligning, analysis, stacking.

After the stacking process I go to the process tab and the image has a color cast to it.....

Your color cast may come from the flat field. If this is the case, you can check the monochrome button before stacking the flat fields (and re-stack the "light").


Is there a way with Lynkeos to enable all images in a list for stacking without going through the alignment step, or alternatively, initialize the dx and dy offsets to zero or other fixed value so they can be stacked without individual alignment ?

The "Manual align" plugin provides this feature ; it is part of the "Lynkeos eclipse chaser plugin pack", which you can find in the download page.

Tips :

  • You can make a search square specific to an image by pressing the "alt/option" key while dragging the square. The square will change position only for that image ; others keep the "common" search square. In V2.0, there is also a "Specific" checkbox for that pupose.

Saving the result

I cannot save in FITS although I have installed the CFITSIO library package.

Only monochrome images can be saved in FITS.