sippsolutions

If you host your site in a poor environment, WordPress may fail uploading large images as the process of creating the different sizes and thumbnails takes a large amount of CPU usage.
With this Plugin the images are simply resized to a maximum dimension (of for example 1600 x 1600 pixels) right in your browser before uploading them. 
The nice side effect is that unnecessary big images are resized to a fine size to still provide a usable, qualitative image.
Logo credits: Picture graphic by Flaticon from Freepik.

Canvas Image Resize

Re-sizes images right inside the browser BEFORE uploading them.

parisk85

dippi stands for Digital Image Processing PlugIn and provides basic operations and masks for image manipulation.
Features: 
* Point Operations (brightness, contrast, gamma) 
* Grayscale Operations (Grayscale, Threshold) 
* Blurring Masks (mean, weighted average, Gaussian mask, median filter) 
* Edge Detection Masks (Laplacian, Prewitt, Rrobinson, Sobel, Kirsch) 
* Miscellaneous (Inverse Colours, Sepia, Noise)

My Canvas Shortcode

dippi stands for Digital Image Processing PlugIn and provides basic operations and masks for image manipulation.

Canvas Image Resize vs My Canvas Shortcode