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Crispening kernels:

provide a milder degree of contrast enhancement, hence the name. Unless sharpening and crispening kernels are used intelligently, they can leave a dark ring around bright objects like stars, the result of the ring of negative elements in the kernel.

Because most astronomical images are fairly "soft," a large kernel is usually better for sharpening because the comparison pixels are drawn from a wider area:

Figure 14.10 The original image of Jupiter is full of detail but lacks contrast between the light and dark tones. Subtracting a soft Gaussian mask increased the contrast difference between the features and their surroundings, producing an image in which more detail is visible. Jupiter image by Donald Parker.

Figure 14.10 The original image of Jupiter is full of detail but lacks contrast between the light and dark tones. Subtracting a soft Gaussian mask increased the contrast difference between the features and their surroundings, producing an image in which more detail is visible. Jupiter image by Donald Parker.

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