Digital Image Processing

Image enhancement involves processing remotely sensed images to improve their visual appearance, contrast, and overall interpretability.

QR Decomposition finds applications in various aspects of image processing, including image compression, image enhancement, and image recognition. Its ability to decompose images into orthogonal components makes it useful for extracting features, reducing noise, and performing various image processing operations.

HDR blending involves combining multiple exposures of the same scene with different exposure values to create a panoramic photo with a wider dynamic range, capturing both bright and dark details.

Rotoscoping is the technique used to remove unwanted objects or elements from a film frame. Animators manually trace the outlines of the objects to be removed, and the software then fills in the gaps with the surrounding background.

The best way to adjust the white balance in post-processing is to use a white balance adjustment tool in a photo editing software.

Liquify is not a common editing technique used in portrait photography as it is primarily used for body and facial retouching, which is generally not considered ethical or desirable in portraiture.

Unsharp Mask is a widely used sharpening technique that selectively enhances the edges and details in an image. It works by creating a slightly blurred version of the image and then subtracting it from the original image, resulting in a sharpened effect.

The radius setting in the Unsharp Mask tool determines the amount of sharpening applied to the image. A larger radius value results in a more pronounced sharpening effect, while a smaller radius value produces a more subtle sharpening effect.

To create a sharpening mask using luminosity selections in Photoshop, you can select areas of the image with similar brightness levels. This is because sharpening tends to enhance edges and details that are defined by differences in brightness. By selecting areas with similar brightness levels, you can create a mask that protects those areas from over-sharpening while allowing sharpening to be applied to areas with significant brightness differences.

Adjusting the threshold setting in the sharpening tool can help prevent halos and artifacts from appearing around edges after sharpening. By setting a higher threshold value, you can ensure that sharpening is only applied to areas with significant differences in brightness, reducing the likelihood of halos and artifacts.

A High Pass Filter with a low frequency setting is particularly suitable for enhancing fine details in architectural photography. By allowing only high-frequency components (edges and details) to pass through the filter, while attenuating low-frequency components (smooth areas), this technique selectively sharpens the fine details in the image without over-sharpening the entire image.

To achieve a natural and balanced sharpening effect in architectural photography, you can use a low radius value and a high threshold value in the Unsharp Mask tool. A low radius value ensures that sharpening is applied subtly, while a high threshold value prevents halos and artifacts from appearing around edges. This combination of settings allows you to enhance the clarity and detail of architectural features without over-sharpening the image.

Unsharp Mask is commonly used for sharpening images captured with a tripod in architectural photography. Since tripod-mounted images are typically free from camera shake, Unsharp Mask can be applied more aggressively to enhance the clarity and detail of architectural features without introducing blur or artifacts.

To minimize noise and grain in architectural images before sharpening, it is important to use a low ISO setting during shooting. A low ISO setting reduces the sensitivity of the camera's sensor to light, resulting in less noise and grain in the captured image. This allows you to apply sharpening more effectively without amplifying noise and grain.

Color correction involves adjusting the colors in an image to improve their accuracy and vibrancy.