I'm an experienced Photoshop user (though I only know the basics) who is just beginning to learn Illustrator (on a Mac). I'm working through some tutorials but am stumped on resizing images.
I imported a huge image from Photoshop - about 4,000 pixels wide - which I need to resize twice. First, I just want to reduce it to 1,000 pixels wide to trim my file size. I understand that I can simply grab a corner of the image with my mouse and manipulate it, but how do I keep everything proportionate? In other words, I don't want to decrease the width by 200% and the height by 210%; I want the maintain the same ratio. In Photoshop, I just hold down a key - I think it's Shift or Control - while manipulating the image, but that doesn't seem to work in Illustrator.
I also discovered a Scale function, which I can apparently use to reduce the image by a percentage. But if I choose 25%, will that reduce the image only (leaving an enormous canvas with a huge file size), or will it reduce the whole thing? If the file size is 200 MB, I'd like to reduce it to, say, 25 MB.
After I make my initial size reduction, I'm going to add some colors, then reduce it again - probably to a width of about 200 pixels - before saving it as a gif or png.