Sharpening is primarily used in underwater photography to enhance the clarity and detail of underwater subjects, making them appear more distinct and defined.

Unsharp Mask is a widely used sharpening technique for underwater images captured with a compact camera. It selectively enhances the edges of objects, resulting in improved clarity and detail.

A high-pass filter is advantageous for sharpening underwater images because it selectively enhances the edges of objects while preserving fine details, resulting in a natural and detailed appearance.

The Median filter is effective for reducing noise and grain in underwater images while preserving edges and details. It is particularly useful when sharpening images with significant noise or grain.

The radius parameter in sharpening controls the width of the sharpening kernel, which determines the size of the area around each pixel that is affected by the sharpening process.

The threshold parameter in underwater image sharpening controls the amount of sharpening applied to the image. It determines the level of edge enhancement and the overall sharpness of the image.

The amount of sharpening applied to an underwater image can significantly affect its overall appearance. Excessive sharpening can result in a noisy and unnatural appearance, while insufficient sharpening can lead to a soft and blurry image. The goal is to apply an appropriate amount of sharpening to enhance the clarity and detail of underwater subjects without introducing excessive noise or artifacts.

High-pass filter is a widely used sharpening technique for underwater images captured with a DSLR camera. It selectively enhances the edges of objects while preserving fine details, resulting in improved clarity and definition.

Gaussian blur filter is advantageous for sharpening underwater images because it helps reduce noise and grain while preserving edges and details. It is particularly useful when sharpening images with significant noise or grain.

The effect of sharpening on the file size of an underwater image depends on the sharpening technique used. Some sharpening techniques, such as Unsharp Mask, can increase the file size due to the addition of new data to the image. Other techniques, such as high-pass filtering, may have a negligible effect on the file size.

High-pass filter is a suitable sharpening technique for underwater images with fine details, such as coral reefs or marine life. It selectively enhances the edges of objects while preserving fine details, resulting in improved clarity and definition without sacrificing detail.

The effect of sharpening on the overall contrast of an underwater image depends on the sharpening technique used. Some sharpening techniques, such as Unsharp Mask, can increase the overall contrast by enhancing the edges of objects. Other techniques, such as high-pass filtering, may have a negligible effect on the overall contrast.

The recommended sharpening workflow for underwater images involves a combination of in-camera and post-processing sharpening. In-camera sharpening can be used to apply a basic level of sharpening, while post-processing sharpening allows for more precise control and customization of the sharpening process.

Median filter is a suitable sharpening technique for underwater images with significant noise or grain, such as images taken in low-light conditions. It helps reduce noise and grain while preserving edges and details, resulting in a cleaner and sharper image.