Resolution is a topic that is misunderstood by many,
including some professional artists and designers. The problem lies in the fact that it can
refer to different concepts: the number of pixels in a monitor’s display, the
quality of a printer’s final output, and the amount of detail in a raster image
that is prepared for printing. The last definition is what we want to cover
here.
In this case, the issue of resolution only pertains to raster images that
are to be printed, nothing else. It is common to think of resolution in terms
of DPI, or dots per inch, but as we will see, this is incorrect. Photoshop has
a command just to take care of this issue, Image Size. All images that are
prepared for print should pass through this dialog box. It is divided into two
sections: Pixel Dimensions and Document Size. A quick look at its options shows
that resolution is connected to the printed (or document) size and is actually
measured in PPI, or pixels per inch. Inches (or centimeters in most of the
world) are a real world measurement and only apply to printing on paper.
Monitors, mobile devices, and other screens measure increments in pixels, not
inches. We often think of high resolution as 300 PPI and low resolution as 72
PPI. This is true, but remember that you only need to worry about it when
printing. Since your monitor measures images in pixels and your printer
measures in inches, you need to translate pixels to inches when printing.
That’s where Resample Image comes in. Resample means to add or remove pixels.
No matter what resolution an image has when you open it in Photoshop, you can
change it here in Image Size. Uncheck Resample Image to lock the
Pixel Dimensions. Only the print size changes; the number of pixels stays the
same. Therefore, resolution is relative. Using Photoshop, you can adjust it to what you
need. Just make sure you have a large number of pixels to start with.
It is a common misconception that you need to work in 72 PPI
on images for web. The truth is that browsers, monitors, and other screen
devices don’t use resolution because they don’t see inches. You can work in
whatever resolution you want; just keep the pixel size in mind. It is actually
a good idea to work larger than your final image because you have more detail
to work with. You can even work in high resolution or print size. To make the
final web image, the best way is to use Save for Web. With this dialog box, you
can choose the format you need, adjust compression (if applicable), and resize
the image. Notice that here there is no resolution, only pixel dimensions. No
matter what resolution your image has, if you make a JPG, PNG, or GIF with Save
for Web, then open that image up, its resolution will default to 72 PPI.
With these few points in mind, the mystery surrounding
resolution can finally be solved. Just remember, you only need it when going to
print. For the web, think in pixels and you’ll be fine.
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ReplyDeletenice post :)
Thanks. I hope you find it helpful.
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