Resolution, Pixels, and DPI

August 2008

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Resolution, Pixels and DPI

CADCAM Software for All Woven Textiles

Scanning Solutions
When scanning you should give some thought to the size of image (pixels) that you want to create. Roughly measure one side (i.e. the width or the height) of the area being scanned (inches), and then decide what size of image (pixels) you want. Divide the pixels by the physical size to get the ideal scanning resolution. For example -

Scanner artwork width = 3.5 inches
Required image width = 600 pixels

Ideal scanner resolution = 600 / 3.5 = approx. 172 pixels per inch.

Most scanner drivers have "Advanced", "Setup" or "Custom" options that allow you to enter a scanning resolution. Use this option to set the calculated resolution, scan the image and you will get the required image size.

Scanning For Jacquard Artwork
When scanning for jacquard artwork you should use the above principle to determine the scanning resolution as follows -

1. Examine the artwork to be scanned
2. Measure the width (the edge that will become the warp) in inches
3. Work out how many ends you wish the jacquard design to be
4. Divide the number of ends required by the width to get the scanner resolution

For example, suppose that you have a piece of artwork that is 7 inches wide along what will become the warp edge and that you want the artwork image to create a jacquard 864 ends wide.

Scanner artwork width = 7 inches
Required image width = 864 pixels

Ideal scanner resolution = 864 / 7 = 123.428 dpi

Round this up to a whole number, 124 dpi, and set this as the scanner resolution.

The resulting scan will be 864 pixels wide. You can easily resize the image or crop it down to your required 864 pixels (each pixel will become an "end" in the jacquard program) without losing too much detail.