Is it considered best practice to resize and crop images in Photoshop, saving as a jpeg, and them placing in Muse ... or placing directly into Muse as a .psd file, cropping in Muse and allowing Muse to resize/ save as a .png or .jpg as it sees best?
Best practice is definitely to place images unscaled(!) with exactly the size you need them in your layout. In this case, Muse doesn’t even touch your images, and the output quality will be identical to the input quality. If you scale images, Muse will optimise them during output. It does a quite job in this, but normally you get better results, when you force Muse to leave the images unoptimised (= place them 1:1).
My personal workflow:
If you want/need some more informations, just read my answers in this thread: https://forums.adobe.com/thread/1793996
If you have further questions, just ask!
So if the files are double the size image rectangles still preserve HiDPI, correct?
How about if I load an image fill in a normal rectangle?
Just try it!
If the resolution isn‘t sufficient, the „Assets“ panel won‘t show the „2x“ label.