Guideline:

Use the recommended image resolution settings, or, if the document executes on a high-end printer with a printer resolution greater than 600 DPI, tune the resolution settings in PlanetPress Design to the resolution of that printer. Recall that for best results, the image resolution you set for the document in PlanetPress Design should divide evenly into the resolution of the printer on which you intend to execute the document.

Applies to:

Bitmapped images embedded in EPS or PDF files.

Recall that resolution settings apply to both bitmapped images, and PDF and EPS images. In the case of bitmapped images, they control the size of the image on the printed page when the fit setting for the picture object is set to Constant resolution. In the case of PDF and EPS images, they set the maximum resolution for each of the bitmapped images in the file. The guideline here applies only to the embedded bitmapped images.

Advantage:

Reduces the file size of EPS and PDF images and consequently the amount of runtime processing they require. PlanetPress Design reduces the file size of the image by downsampling the embedded bitmapped images to eliminate extraneous pixels.

How to apply it to static images, and dynamic images that reference image resources:

You set a separate resolution for color, grayscale, and monochrome images in the Document dialog box. Any downsampling that is necessary is performed at document conversion time.

How to apply it to dynamic images that reference external images:

The image resolutions in effect at the time you convert the document apply to all bitmapped images embedded in EPS or PDF files you placed in a folder.

These image resolutions do not apply to any bitmapped images embedded in any EPS or PDF files you downloaded to the printer disk or the local PlanetPress Design Suite virtual drive using the Image Downloader.

Guideline:

Use a fit setting of Constant resolution and downsample images as necessary to achieve the size of image you want at the resolution you set for that type of image in the Document dialog box.

For example, consider the case where the document executes on a 600 DPI printer. You set the color image resolution to 200 DPI. You have a color image with pixel dimensions of 600x600. At Constant resolution it occupies a 3-inch x 3-inch area on the page. You want it to occupy a 1-inch by 1-inch space on the page. Rather than adjust the fit setting and resize the picture object, you downsample the image to pixel dimensions of 200x200.

An exception to this guideline is in the case of a line art image. Line art images should ideally be at the resolution of the printer. Thus if the printer resolution is 600 DPI, you should set the resolution of the line art image to 600 DPI, and, if necessary, use a fit setting that causes the image to resize with the picture object.

Applies to:

Bitmapped images only

Recall that resolution settings apply to both bitmapped images, and PDF and EPS images. In the case of bitmapped images, they control the size of the image on the printed page when the fit setting for the picture object is set to Constant resolution. In the case of PDF and EPS images, they set the maximum resolution for each of the bitmapped images in the file. The guideline here does not apply to embedded bitmapped images.

Advantage:

Reduces the file size and consequently the amount of processing the image requires at runtime. Downsampling eliminates unnecessary pixels.

How to apply it to static images, and dynamic images that reference image resources:

You edit the image resource by selecting it and then using the options in the Object Inspector. You adjust the Height and Width properties of the image resource, or launch an image editor from within the Object Inspector, and adjust the pixel dimensions of the image using the image editor.

How to apply it to dynamic images that reference external images:

You adjust the pixel dimensions of any bitmapped external images you place in a folder, using an external image editor.

If you use the Image Downloader to download the images to the printer or the local PlanetPress Design Suite virtual drive, you must adjust the pixel dimensions of the images using an external image editor prior to downloading them.