I have a Canon PowerShot A75 and have taken great pictures for several years. Recently I have been getting a purplish hue and/or fine horizontal lines OCCASIONALLY on some of my photos--there is no pattern to this problem. New batteries do not rectify the problem. Suggestions?
Unfortunately it's an indication that your camera is in it's death-throes. The symptoms are a classic description of a failing image sensor and the problem will progress to complete failure.
Your camera is about six years old now so, in common with many others of the same age and using similar sensor construction, the sensor is suffering an ongoing degradation due to irreversible chemical and physical processes. The worst affected sensors are those made by Sony, as used in your camera, but others are affected also. Fuji use a radically different design and manufacturing process for the sensors which they use exclusively in their own Finepix cameras and seem to be suffering far less. The cause of the sensor breakdown is now well understood and newer cameras, mostly those made in the last two years, should not be fated to suffer the same issues.
Your camera was designed for around a five year lifespan, so it's done fairly well. Your only fix will be to replace the camera as repairs are not cost effective and you'll have major problems obtaining the spare part required. The repair is not a DIY fix and needs special tools and skills to be a success. Even if you do find the spare part, it's likely to have degraded in storage and highly likely to fail within a few months of first use.
Sorry there's no realistic fix for this fault, but I hope that you've found my posting to be of use and in return I ask only that you take a moment to rate my answer.
Testimonial: "Thanks for the immediate response! I was afraid that the repairs would not be cost effective so I will purchase a new digital camera."
As mentioned, this sounds like it might be a defective CCD imager. Yes your camera is old, but Canon stands behind their product. Canon should fix this for you for free, including free shipping both ways. This is regardless of your camera's warranty status, adn is a worldwide repair advisory. Please check this link for more info.
Applicable cameras include:
A40, A60, A70, A75, A80, A85, A95, A300, A310, S1 IS, S60, S200, S230, S330, S400, S410, S500, SD100, SD110, IXUS V2/V3/300/400/430/500/II/IIs, IXY Digital 200a/300a/320/400/450/500/30/30a
Testimonial: "Thank you for the follow-up suggestion for repairing my Canon PowerShot 75. This proposed solution should be just what I need for continued enjoyment"
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