Illustrator Photoshop & Illustrator: same print size, same DPI, but different size on screen?

[ansiaaa]

lately I've been started working on Illustrator, since I've always loved the vector pen tool in Photoshop, but I've notice something...

let's say I want to work on A4 page. I start a new PRINT document, and set the A4 size at 300 DPI. If I do that on Photoshop, I'll get a huge white page that at 100% goes way out my screen, but if I start a document with the same size in Illustrator, I get a page that's smaller than my screen (at 100%).

I guess it's normal because those programs might work in different ways, but I'm concerned about it because this way, in Illustrator a 1pt size brush will always be bigger than Photoshop...

have you ever noticed? am I doing something wrong? does this affect you in any way?

any feedback about that will be appreciated, thanks!

 

[ibis]

vector programs don't mind the size.
everything you draw is presented through a mathematical functions so any time you scale it up or down program do the calculations and draw the resulting image. it treats raster images similar way-if you scale them up or down it does the dimension requested but increases-decreases dpi resolution of the bitmap so the image quality is constant.
just need to pa y attention when exporting such files because raster is finalized quality.
A4 or similar standard pages are jst for the designer to feel the space and relations on the page.

 

[ansiaaa]

thanks for the explanation!