Image size in TinyMCE editor

[0luckyluke]

I have created a job report app with an html comment field where users can insert images in their report.
This works great, especially on mobile phones where users can choose between an existing image or create a new image on the fly with the camera.
Unfortunately actual camera pictures are huge, so only a small portion shows in the editor window.
Is there a way to

• a. resize an image to a predefined maximum size on upload into TinyMCE (which would also limit the storage space needed per picture)
  or
• b. upload the original image and zoom the picture automatically so that it shows completely in the editor screen.