I often use raster images in Illustrator but don't have a good way to easily keep track of how far away from their native size they've become after resizing and positioning them. What do you recommend? (my raster effects settings are always 300DPI)
Basically, I want to make sure I haven't scaled a raster up so much that it's less than 300DPI anymore - I want an image to have at least 300px per inch in my layouts. I can calculate the dims it shouldn't exceed by divding it's pixel dims, X and Y, by 300 but is there a more convenient way? If only the Transform Panel kept a size percentage . . .
To find what scale image is
Select Image >> Link Palette Flyout menu >> Link Inofrmation
CMD Click on link preview in links palette
To restore to original size:
Select Image >> Link Palette Flyout menu >> Placement Options >> Preserve File Dimension
I believe you can always see the resolution in the Control panel.
At least you can see it in the Document Info palette/panel, with the image selected, and with Selected Only and Object ticked (not Document).
The Document Info palette/panel is set to Document (shown at the top). It should be set to Object instead, and to Selected Only. In the old days there was a right arrow leading to a flyout to set it, but there must be a way.
If/when you get it to work, the resolution in PPI should be shown, along with the pixel by pixel size. In the OP you said you wanted to make sure to keep the former at no less than 300 PPI.
You can see the resolution in post #2 in this thread (in Spanish), with crucial translations in post #3.
What about the Control panel, nothing there?
The reality of it is that it is not reccommended that you resize a raster image in AI and the document raster effects settings have nothing to do with placed images linked or embedded.
To resize your image resize them in an image editt5ing program like Photoshop.
Why you ask?
I'm glad you asked.
You see Illustrator cannot resample your image, that means if you place an image linked or embedded in Illustrator and then scale it only the dimensions change not the file size.
That means if you enlarge it it will be less ppi and if you scale it down it will be more ppi.
In other words=if it starts out as 300ppi at say 4x5 inches and you scale it to say 8x10 inches it will now be 150ppi if on the other hand you scale it down to say 2x2.5 inches then it will be 600 ppi for print niether of those resolutions would be desirable however for the web it might work fine but then you are working in a cmyk document which would indicate you want to send this to press.
So resizing in Photoshop might allow you to go to a master document that would allow you to resave a copy of the files as 8x10 inches or 2x2.5 inches both at 300 ppi which would be good for many four color process jobs. then those resampled files could be placed in Illustrator.
That wpould be the right way to do this so the answer to your questionis there is no real way for a reason it is not the right approach in the first place.
I'm missing where any information in the attached screenshot is relative to the image's native size.
On the attached image I can see the resolution of the apple image reported on your control panel as 30.662 inches per inch. To get 300 ppi you have to scale the apple down to 1.197 by 1.267 inches