Why do my Canon EOS T3 RAW photos show horizontal and vertical line patterns?
Asked 11/25/2017
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I shot some family photos on a Canon EOS T3 after not using it for years. The files are CR2 RAW images, and when I view them I see horizontal and vertical pixel-like lines across the image. I tried Topaz DeNoise, but it did not help. Is this likely a camera problem, or could it be caused by how the RAW files are being opened? What should I use to properly convert them, and is there a good chance I can save these photos?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
8y ago
2 Answers
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You note that the pictures are CR2 images. These are Canon RAW files — they are not, in that state, usable for sharing and printing and so on. You need software to convert them. The most popular such software is Adobe Lightroom, but you can also download Canon Digital Photo Professional for free — or use open source software like Rawtherapee.
The key thing here is that the pattern in your picture looks very, very much like an artifact from demosaicing — part of the process of converting the sensor data stored in the RAW CR2 image into final, viewable one. Whatever software you're using to look at these images is doing it wrong. Get Canon DPP or Rawtherapee and use that to convert to JPEG, and there should be no problem.
Originally by user1943. Source · Licensed CC BY-SA 4.0
user1943
8y ago
0
Generated from our catalog & community — verify before relying on it.
This is most likely not sensor damage or a noise problem. Since your files are CR2 RAW files, the grid-like horizontal/vertical pattern is probably a bad RAW preview or demosaicing artifact from the software you’re using to open them.
RAW files are not finished images; they must be properly processed into JPEG, TIFF, etc. Try opening the CR2 files in software that correctly supports Canon RAW files, such as Canon Digital Photo Professional or an established RAW converter like RawTherapee. Then export the images to JPEG.
If the pattern disappears there, your photos are probably fine and the issue was only the RAW conversion, not the camera. Topaz DeNoise won’t fix this if the problem is incorrect RAW decoding rather than actual image noise.
So yes, there is a good chance you can save the pictures: use proper RAW-processing software first, then evaluate the exported result.
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