Two questions regarding file splitting

[johnthelast]

I tried to split a file using AIJ, but it fails with a message that it is not a multi channel. I've included the fits header for your reference. Here os a link to as google drive. The file does split using ASTAP without any issues.

https://drive.google.com/file/d/1ajB5fBIyoPpQP70aP8-kJmfDZzfYEwsO/view?usp=drive_link

The second question is that the image has a Bayer pattern of RGGB, but that pattern does not show up in the Debayer dialogue. Is there a way to add a pattern?

Here is the fits header from the file.

SIMPLE   = T / C# FITS                                        
BITPIX   = 16                                                  
NAXIS   = 2 / Dimensionality                                
NAXIS1   = 3704                                                  
NAXIS2   = 2778                                                  
BZERO   = 32768                                                  
EXTEND   = T / Extensions are permitted                      
IMAGETYP = 'LIGHT'              / Type of exposure                              
EXPOSURE = 20.0 / [s] Exposure duration                          
EXPTIME = 20.0 / [s] Exposure duration                          
DATE-LOC = '2026-04-22T21:25:42.3975531' / Time of observation (local)          
DATE-OBS = '2026-04-23T03:25:42.3975531' / Time of observation (UTC)            
MJD-OBS = 61153.142851817 / Modified Julian Date of observation            
DATE-AVG = '2026-04-23T03:25:53.6144626' / Averaged midpoint time (UTC)          
MJD-AVG = 61153.1429816433 / Modified Julian Date of averaged midpoint      
XBINNING = 1 / X axis binning factor                          
YBINNING = 1 / Y axis binning factor                          
GAIN     = 100 / Sensor gain                                    
OFFSET   = 0 / Sensor gain offset                            
XPIXSZ   = 4.63 / [um] Pixel X axis size                        
YPIXSZ   = 4.63 / [um] Pixel Y axis size                        
INSTRUME = 'SkyRaiderDS10CTEC(USB2.0)' / Imaging instrument name                
CAMERAID = 'MallinCam_\\?\usb#vid_0547&pid_f11f#a&22070cf3&0&1' / Imaging instrum
SET-TEMP = 0.0 / [degC] CCD temperature setpoint                
CCD-TEMP = 1.0 / [degC] CCD temperature                        
READOUTM = 'High Conversion Gain' / Sensor readout mode                          
BAYERPAT = 'RGGB'               / Sensor Bayer pattern                          
XBAYROFF = 0 / Bayer pattern X axis offset                    
YBAYROFF = 0 / Bayer pattern Y axis offset                    
USBLIMIT = 2 / Camera-specific USB setting                    
TELESCOP = 'Planewave 12.5 CDK' / Name of telescope                              
FOCALLEN = 2541.0 / [mm] Focal length                              
RA       = 154.901429409391 / [deg] RA of telescope                          
DEC     = 19.8700239589367 / [deg] Declination of telescope                
CENTALT = 77.7245782405453 / [deg] Altitude of telescope                    
CENTAZ   = 173.536761467462 / [deg] Azimuth of telescope                    
AIRMASS = 1.02329109817361 / Airmass at frame center (Gueymard 1993)        
PIERSIDE = 'East'               / Telescope pointing state                      
SITEELEV = 1343.0 / [m] Observation site elevation                
SITELAT = 31.9465833333333 / [deg] Observation site latitude                
SITELONG = -108.897722222222 / [deg] Observation site longitude              
OBJECT   = 'AD Leo'             / Name of the object of interest                
OBJCTRA = '10 19 36'           / [H M S] RA of imaged object                    
OBJCTDEC = '+19 52 12'          / [D M S] Declination of imaged object          
OBJCTROT = 0.0 / [deg] planned rotation of imaged object        
FOCNAME = 'PWI4 Focuser'       / Focusing equipment name                        
FOCPOS   = 31500 / [step] Focuser position                        
FOCUSPOS = 31500 / [step] Focuser position                        
FOCUSSZ = 1.0 / [um] Focuser step size                        
ROWORDER = 'TOP-DOWN'           / FITS Image Orientation                        
EQUINOX = 2000.0 / Equinox of coordinates                        
SWCREATE = 'N.I.N.A. 3.2.0.9001 (x64)' / Software that created this file        
CTYPE1   = 'RA---TAN'           / first parameter RA,    projection TANgential  
CTYPE2   = 'DEC--TAN'           / second parameter DEC,  projection TANgential  
CUNIT1   = 'deg     '           / Unit of coordinates                            
CRPIX1   = 1.852500000000E+003 / X of reference pixel                          
CRPIX2   = 1.389500000000E+003 / Y of reference pixel                          
CRVAL1   = 1.549454118143E+002 / RA of reference pixel (deg)                    
CRVAL2   = 1.987519797748E+001 / DEC of reference pixel (deg)                  
CDELT1   = 1.049512553692E-004 / X pixel size (deg)                            
CDELT2   = 1.050072929176E-004 / Y pixel size (deg)                            
CROTA1   = 8.502197698252E+001 / Image twist of X axis        (deg)            
CROTA2   = 8.503933611866E+001 / Image twist of Y axis        (deg)            
CD1_1   = 9.107000902222E-006 / CD matrix to convert (x,y) to (Ra, Dec)        
CD1_2   = -1.045553850270E-004 / CD matrix to convert (x,y) to (Ra, Dec)        
CD2_1   = 1.046139670619E-004 / CD matrix to convert (x,y) to (Ra, Dec)        
CD2_2   = 9.080168580153E-006 / CD matrix to convert (x,y) to (Ra, Dec)        
PLTSOLVD = T / Astrometric solved by ASTAP_CLI v2026.03.05.  
COMMENT 7 Solved in 0.2 sec. Offset was 2.5'. Mount offset RA = -2.5', DEC=-0.3'  
WARNING = 'Warning scale was inaccurate! Set FOV=0.29d, scale=0.4", FL=2526mm'  
COMMENT   cmdline:"C:/Program Files/astap/astap_cli.exe" -f "D:/2026-04-22/LIGHT\A
COMMENT   D Leo\AD Leo_2026-04-22_21-25-42__1.00_20.00s_0912.fits" -update -ra 10.
COMMENT   326761960626067 -spd 109.8700239589367 -fov 0.3866962284340181 -r 10.0  
INPUTFMT = 'FITS    ' /          Format of file from which image was read        
SWOWNER = 'John Sikora' /       Licensed owner of software                      
BSCALE   = 1.0000000000000000 /physical = BZERO + BSCALE*array_value          

[karenacollins]

The image you provided came up as RGGB by default and Debayered fine for me.

Be sure you are using the top Debayer option "Debayer to singel color/luminosity 1/4 size stackes". If that doesn't solve your problem, what version of AIJ are you running and what OS are you running?

Karen

[johnthelast]

It looks like I was using the wrong Debayer method. I was using the Debayer from the "Plugins" menu. I did get the same results that you had. I ran into another issue when I carried this forward.

I'm writing a macro to debayer and split a folder of files. I'm assuming that the proper sequence is:

1) Open the image
2) Do the Debayer process you requested
3) Save the individual image files
4) close each window
5) Increment to the next file

When I tried to record the macro to do items 1-4 above the following was recorded which did not show any command invocation to do the debayer or the actual save of the files. I also did not see any Debayer into the quarter size stacks in the command utilities list.

open("C:/Temp/AD Leo_2026-04-22_21-25-42__1.00_20.00s_0912_cal small.fits");
selectImage("AD Leo_2026-04-22_21-25-42__1.00_20.00s_0912_cal small.fits");
selectImage("AD Leo_2026-04-22_21-25-42__1.00_20.00s_0912_cal small.fits");
selectImage("AD Leo_2026-04-22_21-25-42__1.00_20.00s_0912_cal small.fits (RED)");
selectImage("AD Leo_2026-04-22_21-25-42__1.00_20.00s_0912_cal small.fits (RED)");
selectImage("AD Leo_2026-04-22_21-25-42__1.00_20.00s_0912_cal small.fits (GREEN)");
selectImage("AD Leo_2026-04-22_21-25-42__1.00_20.00s_0912_cal small.fits (RED)");
selectImage("AD Leo_2026-04-22_21-25-42__1.00_20.00s_0912_cal small.fits (BLUE)");
selectImage("AD Leo_2026-04-22_21-25-42__1.00_20.00s_0912_cal small.fits (GREEN)");
selectImage("AD Leo_2026-04-22_21-25-42__1.00_20.00s_0912_cal small.fits (BLUE)");
selectImage("AD Leo_2026-04-22_21-25-42__1.00_20.00s_0912_cal small.fits (RED)");
selectImage("AD Leo_2026-04-22_21-25-42__1.00_20.00s_0912_cal small.fits (GREEN)");
selectImage("AD Leo_2026-04-22_21-25-42__1.00_20.00s_0912_cal small.fits (BLUE)");
close;
close;
close;
selectImage("AD Leo_2026-04-22_21-25-42__1.00_20.00s_0912_cal small.fits");
run("Close", "subpixel=RGGB red=true green=true blue=true r+g₁+g₂+b=false r+½(g₁+g₂)+b=false");
  <<warning: the options string contains one or more non-ascii characters>>
close;

[johnthelast]

Just tried to record a macro with the same actions on the newest release 6.0.7.00 and didn't see any specific action record of the "Debayer to single...." to split the file.

Thanks.

[keastrid]

This should be fixed in 6.0.7.01, both the macro recording and the running of the debayer via macros. 6.0.7.01 is released as a daily build, so you will need to check for the update manually in AIJ via Help > Update AstroImageJ

This is the macro code to run it:

run("Photometric Debayer", "subpixel=RGGB red=true green=true blue=true r+g_1+g_2+b=true r+_half(g_1+g_2)+b=true");

The first option, subpixel, is what is the pattern of the file. If not specified by the macro, it will read from the FITS header if available. The other options control which output images are created.

[johnthelast]

Thanks for the fix. It works as described now.