miniGRIP v19.7.12  www.grelf.net

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This is a simple proof of concept. It demonstrates that it is possible using only HTML5/JavaScript to open an image file, process the image in some way, and then save the image in a new file. Importantly this is all done in the client browser; nothing is sent to the server.

A few things should be noted:

• Images larger than the screen may be used. You will see a scaled-down version but the full-sized image is processed and saved. I have tested with JPEG images up to 5472 x 3648 pixels.
• Interaction may be quite slow (possibly confusing) with large images.
• The saved file goes in the user's download folder.
• The open/save dialogue that appears in Firefox wrongly says the file is of type PNG when the file extension is .jpg or .gif. The file will nevertheless be in the required format.
• I have only tested this in Firefox and I would like to know whether it works in other browsers. (gr a grelf d net).

So far the only processing offered is to invert the contrast, to make a negative image. It is planned to extend this to offer image resizing and some other simple processes. Browsers do limit the time available for processing though.

In a sense this is like a tiny, tiny version of the powerful image processor, GRIP, that I developed in Java from 2004 onwards.