New answers tagged resolution
Personally, I wouldn't be trusting php to do the cleanest possible image resizing resample. Resize it in photoshop or gimp and do the first layer of compression there locally. Reduce the jpeg quality of the image in until it starts to get noticeable. Then you can pass it through an optimizer like https://kraken.io/.
The latest version of Illustrator (Illustrator CC 2014 as of this writing) includes a button to “unembed” embedded assets, which lets you save to PSD at native resolution. When you’ve selected your image, the Unembed button appears up in the toolbar next to Image Trace/Edit Original.
I have the feeling there are quite many questions 'hidden' in your question – so I'll try to focus on what I would consider important here: one strategy in reducing file size can be to actually first resize them locally and then only upload photos in the max. size you would want to use them in. However – if you're using a wordpress or a cms that is capable ...
In Photoshop, take a new document. Use Pixels as Units. Use the 1920x1080 as your document size.
DPI used for Print PPI used for anything on screen for things such as games or online banners ETC.
The best way to create icons for all PPIs would be to create vector graphics and export as SVGs or create an icon font. Since the pixel density of devices change, you can't easily plan for them all so you'll be providing many duplicate images at different sizes. Though, if you do, saving a web and a retina sized one will cover most of your bases. And for ...
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