Image transformation filters
Sharpness and Blur
Sharpness describes the clarity of detail in a photo, and can be a valuable creative tool for emphasizing texture. Proper photographic and post-processing technique can go a long way towards improving sharpness, although sharpness is ultimately limited by your camera equipment, image magnification and viewing distance.
The unsharp mask filter is commonly used for sharpening images. Three parameters are used for this task: radius, amount, and threshold. For downsized images, a typical improvement could be use an unsharp mask of 0.3 radius and 0.7-1.5 amount to make up the blurring introduced by the resize operation. With such a small radius value, one does not have to worry about halo artifacts.
Web images are commonly downsized to adjust their size to the visualization device. When downsizing we must minimize the possibility of aliasing and moirè. Sometimes, pre-blur can be used to minimize moiré artifacts. A little blur before downsize can improve results, but a too high can lead to softening in the final image.
The gaussian blur filter allows you to eliminate any detail smaller than what you know is impossible to capture at a lower resolution. If you do not have a problem with moiré artifacts, then there is no need to pre-blur. For instance, if an image is downsized by 1/4 its original size, any repeating pattern smaller than 4 pixels cannot be resolved. A radius of 2 pixels (for a total diameter of 4 pixels) can be used.
Description: Applies a simplest color balance..
Description: Applies a simplest intensity balance.
Description: Applies a retinex tone mapping.
Description: Applies a sharpen filter to the image.
Description: Applies a Gaussian blur filter to the image.
Description: Applies a pixelizer filter to the image.
Description: Converts the image to grayscale.
Description: Desaturates the image.
Description: Applies a brighten effect to the image.
Description: Applies a contrast effect to the image.
Description: Applies a sepia effect.
Description: Applies a sunlight effect to the image.
Description: Applies a lumo effect to the image.
Description: Applies a country effect to the image.
Description: Applies a cartoonify effect to the image.
Description: Applies a sketch effect to the image.
Description: Applies the crossprocess film effect filter.
Description: Applies the velviaesque film effect filter.
Description: Applies the proviaesque film effect filter.
Description: Applies the portraesque film effect filter.
Filters can be pipelined using the separator
|. This can be useful to chain different effects. For example:
Random example without any filter
Random example with a chain of filters
Actions are an experimental feature to provide a powerful content-based edition tool. They are going to be developed to enable smart actions like adaptive watermarking. For instance, changing the text color based on the background color, or using the negative space to place the watermark.
Taking advantage from Abraia face detection features you can easily anonymize any picture with just one command.
Action to easily create MEMES with just a simple url.
Action for a basic watermarking. Overlay the picture bottom with a semitransparent rectangle and centers the text inside it.