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The term for an out-of-focus purple "ghost" image on a photograph is "Purple Fringing."
This is fairly common in Digital Photography.
In order to minimize instances of purple fringing you may incorporate the following:
Avoid shooting with big aperture (Small /f number) in high contrast compositions.
Avoid overexposing highlights (e.g. bright sky behind dark objects).
Shoot with a UV/Skylight Filter or a Circular Polarizing Filter. These protect the lens and also help to Get bluer skies and cut glare off reflective objects.
You could also use Post-processing to remove purple fringing by scaling the fringed color channel. This can be done in an image editor like Photoshop.
These suggestions will help in minimizing the instances of color displacement for you.
I will look forward to your feedback and positive rating.
To create a glow: make a copy of your image you want to glow. paste to the side or original. select original. Convert to Bitmap, then use Gaussian blur, select pixel width of blur, preview it, then apply it when it look good. Put your copied image on top of the blurred image, bringing the copied image TO FRONT. voila
NOTE change color of image to be bit-mapped BEFORE you convert to bitmap for a COLORED Glow
According to many respected sources with far more expertise than myself, the symptoms you are describing also fall within the realm of Canon CCD failure. In Canon's Service Notice: CCD Image Sensor Advisory, they outline the most common symptoms (distorted images, LCD showing only a black screen, etc.). They have conveniently limited the description to the bare minimum. More symptoms of the failing CCD include: pictures appearing on LCD show up with severe color variations (pink-purplish or green tint), colored "streaks" or "lines" throughout pictures, and wavy distortions in image. Most of these symptoms include the color variations, but not always. The lines or waves can appear in any direction and with varying degrees of severity. Some LCDs do not go black, but turn totally purple. Here is a link to a very informative article that should clear up any questions you might have. Digital Camera Repair Blog If nothing else, call the Canon Customer Support Center at 1-800-828-4040. They will ask questions to identify whether or not you are having the same symptoms as described in the Product Advisory. I have been through this twice, and both times they were very nice and very helpful. Even if you don't qualify for the free repair, it didn't cost a thing to find out.
I hope this has been helpful.
The doe problem go away if you bang on the side of the camera? there is a known issue with the CCD sensor on certin model cameras that after a few years the glue or somthing dries up inside the sensor and it developes a bad connection. Canon has admit they know about this problem and they will fix them free of charge and pay shipping both ways. Sometimes users can bang on the side of the camera and the camera will work properly again but not for very long. I cant see your display so im not sure if thats it or not but the problem has this purple blackish symptom. Go to the canon usa webpage and then search around for your camera model and if there is a known issue it will say on their site. Then there are ways to contact them on their site.