Degen1103 Affiliation American Association of Variable Star Observers (AAVSO) Mon, 05/01/2023 - 13:59 Dear observers, would you please explain, why my uploaded FITS file turned in absolutely blank VPhot image? FITS & JPG are here. MZK Affiliation American Association of Variable Star Observers (AAVSO) Mon, 05/01/2023 - 14:28 Screen Stretch Mikhail: White because the screen stretch your processing software used is not within the normal range that VPhot expects. I tried to fix it under tools>display without success. You might try saving it as a 16 bit, not 32 bit, image in AIJ and upload again? Ken Log in or register to post comments Degen1103 Affiliation American Association of Variable Star Observers (AAVSO) Mon, 05/01/2023 - 15:03 32 ->16 Yes, yes, thank you! Indeed after saving in 16 bit all stars disappeared. But camera gives 16 bit gray image, and 32 I got after stacking. Well, I'll try to correct my clumsy processing, now the reason is known. Log in or register to post comments Mike_F Affiliation American Association of Variable Star Observers (AAVSO) Mon, 05/01/2023 - 14:29 Blank fits image Is this a image that you processed. I have seen this if I save a image as a 32 bit fits. It should be saved as a 16 bit fits filts. Mike Log in or register to post comments Degen1103 Affiliation American Association of Variable Star Observers (AAVSO) Mon, 05/01/2023 - 15:16 16 bit helped, but all… 16 bit helped, but all bright stars have white circle in the center - I think, it shows on oversaturation? Probably, better to try single shot or other type of stacking. Maybe better to stack 30 10-sec frames in VPhot, but what to do with flats and darks? Log in or register to post comments
MZK Affiliation American Association of Variable Star Observers (AAVSO) Mon, 05/01/2023 - 14:28 Screen Stretch Mikhail: White because the screen stretch your processing software used is not within the normal range that VPhot expects. I tried to fix it under tools>display without success. You might try saving it as a 16 bit, not 32 bit, image in AIJ and upload again? Ken Log in or register to post comments
Degen1103 Affiliation American Association of Variable Star Observers (AAVSO) Mon, 05/01/2023 - 15:03 32 ->16 Yes, yes, thank you! Indeed after saving in 16 bit all stars disappeared. But camera gives 16 bit gray image, and 32 I got after stacking. Well, I'll try to correct my clumsy processing, now the reason is known. Log in or register to post comments
Mike_F Affiliation American Association of Variable Star Observers (AAVSO) Mon, 05/01/2023 - 14:29 Blank fits image Is this a image that you processed. I have seen this if I save a image as a 32 bit fits. It should be saved as a 16 bit fits filts. Mike Log in or register to post comments
Degen1103 Affiliation American Association of Variable Star Observers (AAVSO) Mon, 05/01/2023 - 15:16 16 bit helped, but all… 16 bit helped, but all bright stars have white circle in the center - I think, it shows on oversaturation? Probably, better to try single shot or other type of stacking. Maybe better to stack 30 10-sec frames in VPhot, but what to do with flats and darks? Log in or register to post comments
Mikhail:
White because the screen stretch your processing software used is not within the normal range that VPhot expects. I tried to fix it under tools>display without success.
You might try saving it as a 16 bit, not 32 bit, image in AIJ and upload again?
Ken
Yes, yes, thank you! Indeed after saving in 16 bit all stars disappeared.
But camera gives 16 bit gray image, and 32 I got after stacking. Well, I'll try to correct my clumsy processing, now the reason is known.
Is this a image that you processed. I have seen this if I save a image as a 32 bit fits. It should be saved as a 16 bit fits filts.
Mike
16 bit helped, but all bright stars have white circle in the center - I think, it shows on oversaturation?
Probably, better to try single shot or other type of stacking. Maybe better to stack 30 10-sec frames in VPhot, but what to do with flats and darks?