bugGNU Astronomy Utilities - Bugs: bug #63490, Crop not working with certain...

 
 

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bug #63490: Crop not working with certain concave polygons

Submitter:  Mohammad Akhlaghi <makhlaghi>
Submitted:  Thu 08 Dec 2022 06:02:25 PM UTC
   
 
Category:  Crop Severity:  3 - Normal
Item Group:  Output not reasonable Status:  None
Privacy:  Public Assigned to:  sks_15
Open/Closed:  Open

Thu 08 Dec 2022 11:38:04 PM UTC, comment #2: 

I just attached a 'polygon-2.reg' file that Juan sent. It contains a different polygon but with the same problem.

(file #54075)

Mohammad Akhlaghi <makhlaghi>
Group administrator
Thu 08 Dec 2022 06:04:50 PM UTC, comment #1: 

Here is a screenshot of the outputs of the commands in the previous post (in the attached 'polygon-1-screenshot.png' file):



The region is shown as the blue polygon, and the white pixels are the actually cropped pixels when given this region.

Mohammad Akhlaghi <makhlaghi>
Group administrator
Thu 08 Dec 2022 06:02:25 PM UTC, original submission:  

The '--polygon' feature of crop is not selecting all the pixels within some special concave polygons!

To reproduce the problem on the polygon that this bug was found on, download the attached 'polygon-1.reg' and run the commands below in the downloaded directory (the first will just make an empty image to run crop on):


$ astarithmetic 1000 1000 2 makenew -oempty.fits

$ astcrop empty.fits --mode=img --polygon polygon-1.reg \
          --polygonout -opolygon-1.fits


Sachin, since you first implemented this feature I assigned this bug to you. But if you don't have time, no problem, just let us know and I'll remove your name ;-).

This bug was reported by Juan Miro; thanks Juan!

Mohammad Akhlaghi <makhlaghi>
Group administrator

 

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attached Files
file #54075:  polygon-2.reg added by makhlaghi (344B - text/x-ms-regedit)
file #54073:  polygon-1.reg added by makhlaghi (343B - text/x-ms-regedit)

 

Depends on the following items: None found

Items that depend on this one: None found

 

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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2022-12-08 makhlaghi Attached File- Added polygon-2.reg, #54075
    2022-12-08 makhlaghi Attached File- Added polygon-1.reg, #54073
        Attached File- Added polygon-1-screenshot.png, #54074
        Carbon-Copy- Added -email is unavailable-

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