June 17, 2009 | Design Basics
Running a design studio means that I receive frequent requests for images. Usually it is a client requesting a jpg image. It could be a jpg image of a photo that was used within a web site design or it could be a jpg file of a completed book cover design.
I nearly always find myself replying to the request by asking for more information. I am not trying to be annoying, I just need to know how an image is to be used so that I can provide the best image possible for your usage.
Let me briefly state that jpgs, gifs and tifs do not resize very well (the reason is content for another blog post, but just take my word). Therefore, I need to know the following:
An image’s final resolution is a combination of size and resolution. When you have an image there is a certain, finite amount of data that makes up the image. As you increase the resolution you will have to decrease the size. An image that is 2″ x 2″ at 72 dpi will be forced to shrink to .48″ x .48″ if you increase the resolution to 300 dpi. The size of the actual file (in kB) is the same, as there is no increase or decrease in the amount of data.
Why can’t you just increase the resolution to 300 and force the file size to increase? You know, somehow make it a high resolution file? Photoshop will let you do this, but there is no more data there to improve the image. You’ve just falsely increased the resolution. This will get ugly fast as your image looks digitized or mushy/blurry.
This is why you really can’t pull an image from a web site and try to resize it larger, and why you definitely cannot put it into a printed document that requires 300 dpi images. Therefore, when I provide a jpg image I need to know the final size and how it is being reproduced.