Instead of sending the whole image file for every receipt shown on the
list page, we now generate thumbnails for them on the fly. This
dramatically reduces the amount of bytes sent for each image, especially
very large, high-quality photographs. It also improves support for
non-image attachments like PDFs, by rendering image previews in the
grid view instead of a broken image placeholder.
We use GraphicsMagic to do the conversion. Its `MagickWand` API is
pretty straightforward and convenient, and it supports a plethora of
image and image-like formats.
Dustin
da3d3e4c8e