They can appear in bothDSLRandpoint-and-shoot camerasand reduce a photograph’s overall quality.
Here’s a look at the various types of image artifacts.
Blooming
Pixelson a DSLR sensor collect photons, which are converted into an electrical charge.
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However, the pixels occasionally collect too many photons, which causes an overflow of electrical charge.
This overflow can spill onto existing pixels, causing overexposure in areas of an image.
This is known as blooming.
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Most modern DSLRs have anti-blooming gates that help drain away this excess charge.
It is sparked by the lens not focusing wavelengths of light onto the exact same focal plane.
You might not see it on the LCD screen, but you will during editing.
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Typically, it’s a red or cyan outline along a subject’s edges.
To prevent this, use lenses with two or more pieces of glass with different refractive qualities.
Jaggies disappear with higher-resolution cameras because the pixels are smaller.
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Sharpening in post-production increases the visibility of jaggies, which is why many sharpening filters contain an anti-alias scale.
Avoid adding too much anti-aliasing; it can diminish image quality.
When you save a file as a JPEG, youcompress the image and lose a little quality.
This causes moire, which looks like wavy colored lines on the image.
Moire is usually not a factor with high-resolution cameras.
To reduce noise, use a lower ISO.
