The Importance of Image Resolution


Why is Resolution Important to Your Digital Decorating Business?
Ever have a customer come into your shop and ask you to print a photo they downloaded off the web?  When you print the image, it looks pixelated and out of focus?

This isn’t something that you did wrong, but it is because the image was not at the right resolution.

Normally Web graphics are 72 dots per inch (dpi) and printed graphics are 300 dpi.  Why the difference?  The reason is because web graphics need to be small in size so that it can be downloaded and viewed quickly.  On your computer screen, 72 dpi is enough resolution, however when you print the images/graphics on paper or any other substrate, it will require approximately 300 dpi (more than 3 times the acceptable screen resolution).     This all has to do with the way the images are produced on your screen and on paper.  As a result, what may look good on the computer screen, may not look good when printed.

When a customer sends a file, ensure you check the resolution before printing it.  This will prevent you from wasting paper on poor resolution graphics and images.  In Photoshop, you can click image -> image size.  This will tell you the size of the graphic and its resolution.  In Corel Draw, you can check the resolution by selecting your image and then checking the bottom bar for the resolution, and the top left corner for the size of the image.

You can change the resolution of an image by shrinking it.  If you shrink the image by 10%, the resolution will increase by 10% and vice versa (ensure that resample image is off in Photoshop).  However, if you want to increase a 72dpi image to a 300dpi image, you would have to shrink it by more than 300%!  Example:  6” x 6” image at 72dpi = 1.44” x 1.44” image at 300dpi

Tips/Hints on Resolution
You are more likely to get away with low resolution images if you are printing onto a t-shirt.  It is harder to get away with low resolution images when printing onto a hard substrate as the smoothness of the surface will show the pixilation more.  In addition, photographs can hide low resolution much better than graphics, text, or solid color images.

If a customer sends you a vector file, you won’t have to worry about resolution because most vector graphics are resolution independent and they do not display dpi in your graphics program.  This is because vector graphics are not images but a series of formulas and numbers that can be scaled with very little problems.  Editable text in a graphic design program are normally vector graphics.

Some images may seem like 300dpi because it says it in your program, but someone may have forced a 72dpi image to a 300dpi, saved it and sent it to you.  If this is the case, it may still not print correctly.

As the old saying goes “garbage in, garbage out” sometimes if your customer sends you an image with low resolution, you simply have to set his/her expectations or flat out reject the image!

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Common Mistakes When Using Sublimation

Many users have had great success with sublimation; they have achieved consistent results every time.  The images are bright, vivid, and match the colors that they have desired.   A few users have had some problems with their images and here are some of the most common mistakes made when using sublimation.  We have duplicated mistakes purposely so that you can compare with our results!

Nozzle Check problems
If the color of your image is off.  For example, if your image has a red tint, or other color tints, there’s a high chance that it is because your nozzles are not firing properly in your sublimation printer.

At the beginning of the day, I always print a nozzle check before I start any jobs as this will ensure that all nozzles are firing.  We suggest daily nozzle checks to prevent virtually all clogs.

Here’s a comparison between a perfect nozzle check and one that isn’t.

Here is a comparison between a print with a perfect nozzle check and one that has a nozzle check problem.

Nozzle print Comparison
The top picture resembles the colors of the original photograph and the bottom one is no where near the original colors

Fixing this problem is very simple.  If your nozzle check isn’t perfect, just clean your nozzle head through your OEM printer driver or through the power driver that you downloaded. And then, perform another nozzle check.  Sometimes it may require more than one head clean to clear the clog.

Check to make sure you are using sublimation paper.

Sublimation requires special sublimation paper for the sublimation inks to release properly when heated.  It is easy to mix up sublimation paper with normal paper as they are both white and feel very similar to one another.  Most standard sublimation papers are only coated on one side (however there are some that are coated on both sides).  You can compare the two sides of the paper to tell sublimation paper and plain paper apart.  The coated side is usually brighter than the uncoated side.  With plain papers, both sides will be the same brightness.


Here is an image of a mug sublimated with normal plain paper.

Printing on the wrong side of the paper

You may be printing on the wrong side of the paper.  As stated above, the coated side of the sublimation paper is brighter than the uncoated side. So be sure to print on the brighter side

If you are printing on the wrong side of the paper, you will get the same result as when you use plain paper.

 

Follow the instructions for your product

Most imprintable blanks will come with their own instructions.  Please follow them carefully.  Each type of blank may have a different set of instructions.  If unsure, please confirm the instructions with your vendor.

   
Here is a comparison between using just the right amount of heat, too much heat, and not enough heat,

As you can see images using too much heat turns the image a bit brown and in some cases the image and text on it will appear pixilated.  And images with insufficient heat will appear faded.

Using the wrong inks


If you accidentally installed the OEM inks that came with your printer instead of sublimation inks, this is what you will get.

Sublimation is an easy to learn method to print onto a variety of substrates including 100% polyester clothing, bags, ceramic mugs, tiles, plaques, etc.  But the instructions have to be followed accurately to achieve consistent results.  Also the setup of your sublimation printer has to be correct.  Sawgrass (A Manufacturer of sublimation inks) has posted excellent videos of how to setup your sublimation printers.  Here are some useful links below for your reference.

Sawgrass Sublijet-R Technical Support
Sawgrass Sublijet-IQ Technical Support