Error in _read_header method

[MChetanSR]

Hi,

When I try imFile = SIFFile('Image.sif'), I get "could not convert string to float: b'\x03'" error on the line 107 self.center_wavelength = float(wavelength_info[3]). The sif file is here: https://github.com/MChetanSR/Scrap/blob/master/shadow_imag_1167.sif

Thanks

[lightingghost]

I checked the sif file you provided, I am sorry this seems to be created with a newer version of Andor program. I cannot have the newer program on our computer. So currently the newer version file is not supported. I will try to add an alert for it.

[praoiticica]

I had a similar error. To parse my '2854.sif ' file using SIFFile() I got the error

~\Anaconda3\lib\site-packages\sifreader-0.2.4-py3.7.egg\sifreader\sifreader.py in (.0)
109 self.grating_blaze = float(wavelength_info[7])
110 if i == 19:
--> 111 self.wavelength_coefficients = [float(num) for num in line.split()][::-1]
112 if 7 < i < headerlen - 12:
113 if len(line) == 17 and line[0:6] == b'65539 ':

ValueError: could not convert string to float: b'Pixel'

The if statement i==19 assumes that the wavelength_coefficients is in the line 19 of the .sif file header. In the .sif image obtained in our Andor software, the wavelength coefficients is in the line 12. In my case the header line 19 contains the string b'Pixel number6'. The header length is 24 and not 32.

I tryed to change the code in sifreader.py and install the coustomized lib but it do not works. If you can help us in this issue please reply.

regards
Pedro Ramon

[MChetanSR]

Hi, The new .sif file cannot be read accurately with this class. The header info is not just present at the start of the file. It's also present in the middle of the file sometimes. Sometimes the number of lines in the header are different. Better use Andor's ATSIFIO.dll. Or save it as .tif or .fits format in the camera. These are well documented and code to reader these files is already present. Regards, Chetan.

…

On Fri, Jul 12, 2019, 12:57 AM Pedro Oiticica ***@***.***> wrote: I had a similar error. To parse my '2854.sif ' file using SIFFile() I got the error [image: image] <https://user-images.githubusercontent.com/15385543/61069246-3a720c80-a3e2-11e9-98b6-47030a3d44a4.png> ~\Anaconda3\lib\site-packages\sifreader-0.2.4-py3.7.egg\sifreader\sifreader.py in (.0) 109 self.grating_blaze = float(wavelength_info[7]) 110 if i == 19: --> 111 self.wavelength_coefficients = [float(num) for num in line.split()][::-1] 112 if 7 < i < headerlen - 12: 113 if len(line) == 17 and line[0:6] == b'65539 ': ValueError: could not convert string to float: b'Pixel' The if statement i==19 assumes that the wavelength_coefficients is in the line 19 of the .sif file header. In the .sif image obtained in our Andor software, the wavelength coefficients is in the line 12. In my case the header line 19 contains the string b'Pixel number6'. The header length is 24 and not 32. I tryed to change the code in sifreader.py and install the coustomized lib but it do not works. If you can help us in this issue please reply. regards Pedro Ramon — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#7?email_source=notifications&email_token=AEYZJA73YVDKBZR224VFHDLP65Q6ZA5CNFSM4HDX3VKKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODZXKRPQ#issuecomment-510568638>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEYZJAZKECSJHRVNNG2SJBLP65Q6ZANCNFSM4HDX3VKA> .