如何在果园CMS中添加自动图像水印？

Question

I use Orchard cms. I want when images uploaded, the images get watermark automatically. How can I do this?

Answer 1

To add watermark automatically, you have to add a OnPublished handler for ImagePart as following:

OnPublished<ImagePart>((context, part) => {
    var mediaPart = part.As<MediaPart>();
    // Here you can add watermark code
});

If you want to add the watermark on the original uploaded image, you have to call it from the handler directly, but if you want to use media processing module mechanism (Which will keep the original image as is, and create a new one with filters applied and save it in _Profiles folder), then you can add a new implementation for IImageFilterProvider to add a new filter for Orchard media processing pipeline.

Finally, I recommend you to use ImageResizer.Plugins.Watermark plugin to achieve this, because Orchard already use ImageResizer component as default image processing framework.

Update: Please refer to this link for complete implementation, or this repo for source code.

Answer 2

This should be possible by providing a custom implementation of IImageFilterProvider . Search for this interface in the solution, you will find a ResizeFilter and FormatFilter in the Orchard.MediaProcessing module as an example.

Also, there are some articles like http://www.davidhayden.me/blog/developing-custom-image-filters-in-orchard-cms .