Twitter was just an arbitrary example. I want the image to be 500x500 and be retina ready.
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Well. if you just want to force the 500 by 500 into social media posts you will not have them fit flush since they are all different sizes. You just double the size for whatever the size is for the social media site asks for if you want retina, if you want it to fit nice and flush
i do this for a marketing team. i just make them in different sizes since they want them to fit flush.
I want the image to be 500x500 and be retina ready.
There's no such thing as "retina ready". If they specify 500 x 500 pixels, make a file at 500 x 500 pixels in Photoshop.
Yes, it will look tiny on a retina screen, which is why web browsers and many viewers scale the file up by a linear factor of 2, when such a high-density screen is detected. So it displays at "normal" size, what people are used to from traditional displays.
But the file is still 500 x 500 pixels!
If you make it at 1000 x 1000, the same web browser scaling happens, so it will be twice what you want.
You need to realize that this web browser upscaling is a workaround, a hack to put it bluntly. It will no longer be necessary when the day comes that we all have high resolution screens. That day, web designers will just start to design with more pixels, and it will display normally without this hack.