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Image Resolution

Image Sizing

Image Resolution Image Sizing
Get the most out of your digital images.
A practical list of Do's and Don'ts for resizing images in Photoshop.
     

Line Art

Scanning Photos

Vector Images Scanning Photos
What's the ideal setting for high-quality offset print production?
Industry-standard procedures


For submissions, the press prefers digital images. If authors wish to submit original photos and artwork, they must be camera-ready illustrations of professional quality. Please contact the Press regarding submission of original artwork.


 

 

 

Image Resolution
It is extremely important that the correct resolution is used when submitting digital artwork.
The minimum requirements for resolution in raster files are:

  • 1,200 dpi (dots per inch) for line art (i.e., black-and-white line drawings, maps, and plans in
        bitmap [.bmp] mode)

  • 300 dpi for halftones (i.e., black-and-white photos in grayscale mode)

  • 300–400 dpi for color photos (CMYK mode)

  • 600 dpi for combination halftones (i.e., images containing drawings/photos with text labels in
        grayscale mode)
  • Figure 1: Color photo 300 dpi. Figure 2: Color photo 72 dpi.

  • Vector files (.eps) do not have resolution requirements and are preferable when submitting plans,
        graphs, drawings, etc.
  • Image Resolution for Halftone Scans
    When submitting halftones, use the TIFF file format. Halftones are images that are not just black and white, but, various shades of gray or color gradation. The minimum requirements for resolution in halftone images are 300 dpi.
    Figure 3: 300 dpi. Figure 4: 150 dpi.

     

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    Image Sizes
    All artwork should be submitted at their actual size (i.e., 100% final print dimensions for publication). Crop figures so that no unnecessary white space is left bordering the figure. This will help reduce the file size.
    Figure 5: Original size 3.5 in. x 4.5 in. 600 dpi. Figure 6: Original image enlarged at 200%.

    Do's & Don'ts         

    DO's DON'Ts
    DO decrease your images but not by more than 20%.

    DON'T enlarge your images by more than 20%.
    A larger percentage will cause blurriness and pixelation in your images.
    DO use TIFF and EPS graphic file formats.
    DON'T use other graphic file formats like PICT, JPEG, PNG, or GIF. These are low resolution file formats generally used for viewing from the web or other desktop applications such as Microsoft Word and Power Point. They are insufficient for professional offset printing. After re-sizing your image, try to convert files into TIFFs in Photoshop with proper dpi (dots per image). If you are unable to convert your images, consult with the art department at the press to discuss an alternative.

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    Line Art (drawn then scanned or Vector Files)

    1200 dpi is the proper setting for high-quality offset printing when handling line art. Line art is defined as a graphic image containing no shades of gray, with solid black and white edges. Below is an example of properly scanned line art (on the left) and line art improperly scanned (on the right). Please note the clean curves on the properly scanned image, which is set at 1200 dpi.

    Use the EPS file format for all line art, charts, illustrations, clipart, etc. that were created or edited in vector applications such as Adobe Illustrator or Freehand. Line-art graphics may contain clipping paths from Adobe Photoshop as well.

    If your image is from an original drawing that was scanned and opened in Adobe Photoshop, make sure that the resolution is 1200 dpi, which is standard because it creates the sharpest and most professional print quality finish. Save images with clipping paths from Adobe Photoshop as EPS files.

    Figure 7: 1200 dpi. Figure 8: 72 dpi.

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    Scanning Photos

    As a practice, always avoid using previously printed images such as halftones from books, magazines, etc., in order to avoid creating a moiré effect in the image. A moiré is an unwanted pattern or series of low-opacity yellow lines that occur when an image is scanned from a professional publication.

    Figure 9: Original image.
    Figure 10: Scan of previously printed image from a magazine.

    Do's & Don'ts         

    DO's DON'Ts
    DO scan color images at a minimum of 600 dpi.
    DON'T enlarge your images by more than 20%. A larger percentage will cause blurriness and pixelation in your images.
    DO scan your bitmap TIFF images at a minimum of 1200 dpi. A lower dpi will cause pixelated stair-stepping or distortion.
    DON'T save images with RGB as the selected color mode.
    DO make sure that your files are saved with the full and appropriate file extension.

    e.g., filename.eps

    DON'T save your image in a MS Word document. While MS Word will let you do that, it is only for word processing. MS Word is not graphics software. All resolution will be lost and your size will not be accurate.

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