Managing Dynamic Media image presets

application/pdf

application/postscript

application/illustrator

Choose a format from the menu.

Choosing JPEG offers the following additional options:

• Quality - Controls the JPEG compression level. This setting affects both file size and image quality. The JPEG quality scale is 1-100. Scale is visible when you drag the slider.
• Enable JPG Chrominance Downsampling - Because the eye is less sensitive to high-frequency color information than high-frequency luminance, JPEG images divide image information into luminance and color components. When a JPEG image is compressed, the luminance component is left at full resolution, while the color components are downsampled by averaging together groups of pixels. Downsampling reduces the data volume by one half or one third with almost no impact on perceived quality. Downsampling is not applicable to grayscale images. This technique reduces the amount of compression useful for images with high contrast (for example, images with overlaid text).

Choosing GIF or GIF with alpha provides these additional GIF Color Quantization options:

• Type - Select Adaptive (the default), Web, or Macintosh. If you select GIF with Alpha, the Macintosh option is not available.
• Dither - Select Diffuse or Off.
• Number of Colors - Enter a number between 2 and 256.
• Color List - Enter a comma-separated list. For example, for white, gray, and black, enter 000000,888888,ffffff.

Choosing PDF, TIFF, or TIFF with alpha provides this additional option:

• Compression - Select a compression algorithm. Algorithm options for PDF are None, Zip, and Jpeg; for TIFF are None, LZW, Jpeg, and Zip; and for TIFF with Alpha are None, LZW, and Zip.

Choosing PNG, PNG with Alpha, or EPS provides no additional options.

You can override the default rendering intent. Rendering intents determine what happens to colors that cannot be reproduced in the target color profile (out of gamut). The Render Intent is ignored if it is not compatible with the ICC profile.

• Select Perceptual to compress the total gamut from one color space into another color space when one or more colors in the original image is out of the gamut of the destination color space.
• Select Relative Colorimetric when a color in the current color space is out of gamut in the target color space and you want to map it to the closest possible color within the gamut of the target color space without affecting any other colors.
• Select Saturation to reproduce the original image color saturation when converting into the target color space.
• Select Absolute Colorimetric to match colors exactly with no adjustment for white point or black point that would alter the image's brightness.

Select None, Sharpen, or Unsharp Mask.

• Select None to disable sharpening.
• Select Sharpen to apply a basic sharpening filter to the image after all scaling takes place. Sharpening can help compensate for blurriness that can result when you display an image at a different size.
• Select Unsharp mask to fine-tune a sharpening filter effect on the final downsampled image. You can control intensity of effect, radius of the effect (measured in pixels) and a threshold of contrast that will be ignored. This effect uses the same options as Photoshop’s “Unsharp Mask” filter.

In Unsharp Mask, you have the following options:

• Amount - Controls the amount of contrast applied to edge pixels. The default real number value is 1.0. For high-resolution images, you can increase it to as high as 5.0. Think of Amount as a measure of filter intensity.
• Radius - Determines the number of pixels surrounding the edge pixels that affect the sharpening. For high-resolution images, enter a real number from 1 through 2. A low value sharpens only the edge pixels; a high value sharpens a wider band of pixels. The correct value depends on the size of the image.
• Threshold - Determines the range of contrast to ignore when the unsharp mask filter is applied. In other words, this option determines how different the sharpened pixels must be from the surrounding area before they are considered edge pixels and are sharpened. To avoid introducing noise, experiment with integer values between 2 and 20.
• Apply to - Determines whether the unsharpening applies to each color or brightness.

Sharpening is described in Adobe Dynamic Media Classic Image Quality and Sharpening Best Practices.

Select a Resampling mode option. These options sharpen the image when it is downsampled:

• Bi-Linear - The fastest resampling method. Some aliasing artifacts are noticeable.
• Bi-Cubic - Increases CPU usage but yields sharper images with less noticeable aliasing artifacts.
• Sharp2 - Can produce slightly sharper results than Bi-Cubic, but at an even higher CPU cost.
• Bi-Sharp - Selects Photoshop default resampler for reducing image size, which is called bicubic sharper in Adobe Photoshop.
• Each Color and Brightness - each method can be based on color or brightness. By default Each Color is selected.

Beyond the common image settings available in the UI, Dynamic Media supports numerous advanced image modifications that you can specify in the Image Modifiers field. These parameters are defined in the Image Server Protocol command reference.

Important: The following functionality listed in the API is not supported:

• Basic templating and text rendering commands: text= textAngle= textAttr= textFlowPath= textFlowXPath= textPath= and textPs=
• Localization commands: locale= and req=xlate
• req=set is not available for general usage.
• req=mbrset
• req=saveToFile
• req=targets
• template=
• Non-core Dynamic Media services: SVG, Image Rendering, and Web-to-Print