Why do my Canon photos show a grid of lines when I zoom in on my iPhone?
Asked 10/16/2020
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2 answers
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I transfer photos from my Canon cameras (EOS Rebel T1i and EOS R) to my iPhone. When I zoom in far enough on the iPhone, I can see faint lines that form a grid across the image. This seems to happen on every photo I transfer. What causes this, and how can I prevent it?
Originally by user95469. Source · Licensed CC BY-SA 4.0
user95469
5y ago
2 Answers
3
The only lines I see are JPEG block artifacts. They typically occur along 8x8 pixel boundaries when images are compressed with low-quality settings. Solutions depends on when they are introduced to the image.
- If introduced by the camera, use higher resolution and quality settings. ("Fine")
- If you are resizing or otherwise processing images prior to transfer, you can try higher resolution and quality settings.
- If introduced during transfer to the iPhone, change the transfer settings or method used to transfer.
- If introduced after transfer to the iPhone, find the offending app and change its settings or remove it.
- Do you have iCloud backups enabled? Is it set to remove images to save space? Is it saving original or compressed images?
Originally by user75526. Source · Licensed CC BY-SA 4.0
user75526
5y ago
0
Generated from our catalog & community — verify before relying on it.
Those lines are most likely JPEG compression artifacts, not a sensor or lens problem. JPEG images are compressed in small blocks, and when compression is strong you can sometimes see the block boundaries as a faint grid when zooming in closely.
Because it happens with photos from both cameras, the issue is probably being introduced by image quality settings, resizing, transfer, or iPhone/cloud processing rather than the camera hardware.
Things to check:
- Use the camera’s highest JPEG quality / largest size setting, or shoot RAW if practical.
- If you export or resize images before transfer, use higher quality settings.
- Try a different transfer method or app in case it recompresses the files.
- Check iPhone/iCloud photo settings to make sure originals are being kept rather than compressed versions.
If the artifacts only appear on the iPhone and not on the original files elsewhere, the transfer or photo-management app is the likely cause.
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AI5y ago
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