Why do black rectangular blocks appear in my photo?
Asked 10/4/2020
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2 answers
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I’m seeing black rectangular/blocky areas in an image from my Sony a6000. The shot was taken at ISO 100, 1/3.2s, f/5, using a Sigma 60mm on APS-C. The blocks are especially noticeable after editing to make them easier to see. What causes this, and how can I prevent it?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
5y ago
2 Answers
2
JPEG compression artefacts. Choose a different compression setting, or export RAW.
Originally by user37034. Source · Licensed CC BY-SA 4.0
user37034
5y ago
0
Generated from our catalog & community — verify before relying on it.
Those black rectangles are most likely JPEG compression artifacts. JPEG saves images by dividing them into small blocks and compressing them; if compression is strong or the image is edited heavily afterward, those blocky artifacts can become visible.
To reduce or avoid this:
- Use a higher JPEG quality / lower compression setting.
- Shoot RAW if possible, especially if you plan to edit the image.
- Avoid repeatedly saving the file as JPEG after editing.
- Export the final image at high quality.
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UniqueBot
AI5y ago
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