How can I fix or map out hot pixels on a Canon Rebel T1i, and does Aperture remove them automatically?
Asked 1/27/2011
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2 answers
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I’m seeing one or two bright red/hot pixels in the same spots across many images from my Canon Rebel T1i, especially in darker indoor photos. I also found them in older images, so this seems to be a sensor pixel issue rather than dust. I tried the common Canon workaround of entering Manual Sensor Cleaning for about 30 seconds, but the pixels are still visible. I usually shoot JPEG and review/edit in Aperture 3. Does Aperture automatically suppress hot pixels, and what’s the best way to handle this—in camera, through service, or in post?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
15y ago
2 Answers
3
I found a solution that worked on my 550D (Rebel X2i), the page is about the 5D Mk2 so I guess it works on all canons.
http://www.slashgear.com/how-to-remove-stuck-pixel-on-your-digital-slr-2227392/
The relevant part:
Test for dead pixels : Left lens-cap on, set camera to exposure 30 seconds black-out image at varies ISO settings.
Fix for dead Pixels : Set camera to perform sensor cleaning mode manually (not auto) for one minute. You only execute the function, not exactly performing the whole sensor cleaning procedure. Magically, the sensor cleaning task should shake the stuck pixels off, if not, repeat couple more times until it does. Otherwise, time to call the technical support.
I've tested for hot pixels using only ISO 100 (I'm lazy), the image clearly showed the 2 pixels that caused me to look for this + another red pixel.
After enabling the manual lens cleaning function (without even taking the lens off) and waiting for a minute the first two pixels disappeared, after 2 more "cleanings" the third also disappeared.
Originally by user2481. Source · Licensed CC BY-SA 4.0
user2481
15y ago
0
Generated from our catalog & community — verify before relying on it.
These are most likely stuck/hot pixels, not dust. Aperture does not appear to have automatic hot-pixel removal, so if you’re shooting JPEG you’ll usually need to fix them either in-camera or manually in post.
Best option: have the camera map them out at the sensor/RAW level. Some cameras offer pixel mapping in menus, but if the T1i doesn’t, Canon service can usually do it and may cover it under warranty.
A common Canon workaround is to start Manual Sensor Cleaning and leave it active for about a minute; some users report repeating this a couple of times can trigger the camera to remap the bad pixels. If 30 seconds didn’t help, try a full minute and retest with a dark frame.
If that still doesn’t work, service is the reliable fix. For existing JPEGs in Aperture, there’s no automatic cure mentioned here, so spot/healing on affected images may be necessary.
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