What Is This?
- This topic has 7 replies, 4 voices, and was last updated Aug 1, 2008 at 6:48 pm by
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Just noticed this for the first time, but when I was editing some images at 100%, I noticed some pixels that were bright colors like red, light green, and white. Does this mean my sensor needs to be cleaned, or worse; is the sensor going bad? Below is a crop with an example.
By the way, what are the rules for publication concerning branding? Can you have company logos etc. in images that magazines publish, or should you try to shoot images that do not show any logos?
My work monitor isn’t calibrated or very good, images tend to be dark, so take this with a grain of salt.
I cant see any hot pixels 🙂 and only a couple spots that look like they might be dust or streaks.
A red pixel can mean a couple things.
1) A dead pixel
2) Dont know why but they sometimes show up. In my case usually in long exposures (bulb). Not soething I worry aboutJohn B.,
Funny you mention long exposures. As I was thinking about this late last night after my initial post, I realized that the images I was seeing this in were all images with long exposures 10 – 30 seconds. So, I think you hit the nail on the head and this is the culprit. The specs don’t show up as well on my work monitor either, but at home on my calibrated monitor, they are very bright: red or whitish green, and they look like the size of actual pixels. What can be done, other than a lot of cloning to edit these hotspots out of the image? Is this charateristic of most digital camera’s when taking long exposures? Is there anything else I should be doing that will help eliminate this?
Hot pixels are hard to correct; ultimately you just have to clone them out.
Logos are disfavored but if the image is gripping enough, they’ll run it anyway.
John Michael, hot pixels show up in long exposures because of the increased noise. Some cameras, Canon 30D, for instance have a Long Exposure Noise Reduction setting (C.Fn-02). If I remember correctly default is OFF. I leave mine set to Auto since I sometimes do star trails and night shots. But ON may reduce noise even for those shots which AUTO would not detect. You might try it if it is available on your camera body.
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