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[Solved] Image size in APP is not original size of taken image

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(@ggalbch)
Main Sequence Star
Joined: 5 years ago
Posts: 26
Topic starter  

Hi there,

In my late image processing sessions I started to see final images coming out with a longer ratio then accustomed. First I didn't pay too much attention. But after looking at specific patterns I realized that the images loaded into APP already had a narrowed field of view then the originals. What is the reason for this cropping in first place? How can this be avoided? I have added a file showing original size of taken image and the size of loaded image into APP.
I am curious how to avoid this and make use of full image scale.

Image size discrepancy

 

Thank you
Georg

 

EDIT by Mabula: solved, camera settings is not using default aspect ratio of sensor as shown by CR2 metadata.


This topic was modified 4 years ago by Mabula-Admin

   
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(@Anonymous 174)
Joined: 9 years ago
Posts: 5702
 

Could you explain what kind of data exactlt you're trying to load in and what steps you made before loading in the data? APP never crops an image during loading.



   
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(@ggalbch)
Main Sequence Star
Joined: 5 years ago
Posts: 26
Topic starter  

@vincent-mod 

Hi Vincent

In the attachment, the bluish image is the CR2 image from my Canon T6i camera. I load the CR2 files via LIGHT button into APP and I see the more greenish, cropped in height image. The processed image has the same ration. It looses top and bottom information from the beginning. 

image


   
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(@Anonymous 174)
Joined: 9 years ago
Posts: 5702
 

Very interesting, I think it's best for me to have a look at the data. Please upload like 5 lights and your master calibration files.

Go to https://upload.astropixelprocessor.com and for the username and password, use the word: upload

Create a directory named “ggalbch-croppedImages” and upload in there. Thank you!



   
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(@ggalbch)
Main Sequence Star
Joined: 5 years ago
Posts: 26
Topic starter  

Thank you Vincent

I have uploaded the 9 Lights, the master calibrations and the stacked image as well.
Please let me know if you have any further questions.

Thank you in advance for looking into this.
Best regards

Georg



   
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(@Anonymous 174)
Joined: 9 years ago
Posts: 5702
 

I see the same indeed, Mabula is looking at it.



   
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(@mabula-admin)
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Joined: 9 years ago
Posts: 5356
 
Posted by: @ggalbch

@vincent-mod 

Hi Vincent

In the attachment, the bluish image is the CR2 image from my Canon T6i camera. I load the CR2 files via LIGHT button into APP and I see the more greenish, cropped in height image. The processed image has the same ration. It looses top and bottom information from the beginning. 

image

Dear Georg, thank you vey much for sharing your data issue here.

I have investigated the issue. From the dimensions that APP reports, you can clearly see the raw dimensions and the cropped dimensions, right?

So you see that APP crops almost 700 pixels in height on your images. Now this actually is not APP making a mistake here... let me explain:

My test image of the Canon EOS 750D shows the normal image aspect ratio for your camera:

Notice at the bottom the image dimensions reported by APP: 6000x4000 - 6096x4056 and to the left of the image, you can see the metadata of the CR2 file, the Canon Makernote shows AspectInfo: 0 6000 4000 0 0

EOS 750D 6000x4000 normalRawCrop

Now we check your frame, shows 6000x3376- 6096x4056 and Canon Makernote shows AspectInfo: 7 6000 3376 0 312

EOS 750D 6000x3376 changedRawCrop different Aspect Ratio set in camera

So APP is doing what you told the camera to do, you must have set your camera to use a different aspect ratio of the sensor 😉

If another application is showing it differently, then that application is having an issue clearly.

Many photographers play with this, some use only part of the sensor, like using APS-C format with a Full-Frame camera because the optics can only illuminate an APS-C sensor. If we would not follow these settings set in camera by the user, it creates more issues as you can imagine so we need to follow this.

Mabula



   
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(@ggalbch)
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Joined: 5 years ago
Posts: 26
Topic starter  

@mabula-admin 

 

Thanks Mabula and Vincent

Apologies and thank you for pointing me in the right direction. 
I suspect one of the nights in December while I imaged, I must have clicked on the menu and accidentally changed the ratio while searching for another setting in the dark. Dahhh.... Never good to change things in the dark.
I only realized this change in the last processing while I was trying to identify a tiny object crossing the lower part of the image, an area that was not in the finished image. But now I see that other images from mid December have same ration too. So, yes. My fault. Apologies again and thank you.

Georg



   
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(@mabula-admin)
Universe Admin
Joined: 9 years ago
Posts: 5356
 
Posted by: @ggalbch

@mabula-admin 

 

Thanks Mabula and Vincent

Apologies and thank you for pointing me in the right direction. 
I suspect one of the nights in December while I imaged, I must have clicked on the menu and accidentally changed the ratio while searching for another setting in the dark. Dahhh.... Never good to change things in the dark.
I only realized this change in the last processing while I was trying to identify a tiny object crossing the lower part of the image, an area that was not in the finished image. But now I see that other images from mid December have same ration too. So, yes. My fault. Apologies again and thank you.

Georg

No problem Georg @ggalbch 😉

Happy to have solved the issue ! Did you find the setting in your camera that was responsible?

Mabula



   
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(@ggalbch)
Main Sequence Star
Joined: 5 years ago
Posts: 26
Topic starter  

@mabula-admin 

Yes, it was on 16:9 instead of my normal 4:3 setting.
Thank you again.



   
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(@mabula-admin)
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Joined: 9 years ago
Posts: 5356
 

Great, that explains it !

Mabula



   
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