BICUBIC DOWNSAMPLING PDF

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Adobe PDF options are divided into categories. Changing any option causes the name of the preset to change to Custom. The categories are listed on the left side of the Save Adobe PDF dialog box, with the exception of the Standard and Compatibility options, which are at the top of the dialog box.

Specifies if artwork should be compressed and downsampled, and if so, which method and settings to use. Although the options are the same as in the Print dialog box, the calculations are subtly different because PDF is not output to a known page size. Displays a summary of the current PDF settings.

During PDF conversion, the file that is being processed is checked against the specified standard. If the PDF will not meet the selected ISO standard, a message appears, asking you to choose between canceling the conversion or going ahead with the creation of a non-compliant file.

The latest version will include all the newest features and functionality. The following table compares some of the functionality in PDFs created using the different compatibility settings. Note: Acrobat 8. PDFs can be opened with Acrobat 3.

However, features specific to later versions may be lost or not viewable. Most PDFs can be opened with Acrobat 4. Cannot contain artwork that uses live transparency effects. Any transparency must be flattened prior to converting to PDF 1. Supports the use of live transparency in artwork. The Acrobat Distiller feature flattens transparency. Displays the description from the selected preset, and provides a place for you to edit the description. You can paste a description from the clipboard.

Preserve Illustrator Editing Capabilities. Saves all Illustrator data in the PDF file. Note : The Preserve Illustrator Editing Capabilities option counteracts aggressive compression and downsampling. If file size is a concern, deselect this option.

Embeds a thumbnail preview for each page in the PDF, increasing the file size. Deselect this setting when users of Acrobat 5. This allows Adobe Acrobat 6, 7, and 8 users to generate multiple versions of the document from a single file.

When saving artwork in Adobe PDF, you can compress text and line art, and compress and downsample bitmap images. Depending on the settings you choose, compression and downsampling can significantly reduce the size of a PDF file with little or no loss of detail and precision.

Each section provides the following options for compressing and resampling color, grayscale, or monochrome images in your artwork. Note: The Preserve Illustrator Editing Capabilities option in the General preferences area counteracts aggressive compression and downsampling. If you plan to use the PDF file on the web, use downsampling to allow for higher compression. If you plan to print the PDF file at high resolution, do not use downsampling. Deselect the option to disable all downsampling options.

Downsampling refers to decreasing the number of pixels in an image. To downsample color, grayscale, or monochrome images, choose an interpolation method —average downsampling, bicubic downsampling, or subsampling—and enter the desired resolution in pixels per inch.

Then enter a resolution in the For Images Above text box. All images with resolution above this threshold will be downsampled. Averages the pixels in a sample area and replaces the entire area with the average pixel color at the specified resolution. Chooses a pixel in the center of the sample area and replaces the entire area with that pixel color. Subsampling significantly reduces the conversion time compared with downsampling but results in images that are less smooth and continuous.

Uses a weighted average to determine pixel color, which usually yields better results than the simple averaging method of downsampling. Bicubic is the slowest but most precise method, resulting in the smoothest gradations.

Determines the type of compression that is used. The Automatic option automatically sets the best possible compression and quality for the artwork contained in the file. For most files, this option produces satisfactory results. Works well on images with large areas of single colors or repeating patterns, and for black-and-white images that contain repeating patterns. ZIP compression can be lossless or lossy, depending on the Quality setting.

Is suitable for grayscale or color images. JPEG compression is lossy , which means that it removes image data and may reduce image quality; however, it attempts to reduce file size with a minimal loss of information.

Is the new international standard for the compression and packaging of image data. It also provides additional advantages, such as progressive display. Are only available for monochrome bitmap images. Group 4 is a general-purpose method that produces good compression for most monochrome images.

Group 3, used by most fax machines, compresses monochrome bitmaps one row at a time. Determines the amount of compression that is applied. The available options depend on the compression method.

It determines the size of the tiles for progressive display. Applies compression to all text and line art in the file. This method results in no loss of detail or quality. You can include bleed in your artwork as a margin of error—to ensure that the ink extends all the way to the edge of the page after the page is trimmed or to ensure that an image can be stripped into a keyline in a document.

Places a mark at each corner of the trim area to indicate the PDF trim box boundaries. Places marks outside the artboard for aligning the different separations in a color document. The trim marks are at the edge of the space determined by the offset. Adds a small square of color for each spot or process color.

Spot colors converted to process colors are represented using process colors. Your service provider uses these marks to adjust ink density on the printing press. Places page information outside the artboard of the page. Page information includes the filename, page number, current date and time, and color separation name. Bleed Top, Bottom, Left, Right. Controls the bleeds for the artwork.

When the button is selected, these four values are proportional—editing one will update the values in the other three. Interactions between Output options change depending on whether Color Management is on or off and which PDF standard is selected.

Specifies how to represent color information in the Adobe PDF file. All spot color information is preserved during color conversion; only the process color equivalents convert to the designated color space.

Convert To Destination Preserve Numbers. Preserves color numbers for untagged content in the same color space as the destination profile by assigning the destination profile, not converting to it.

All other content is converted to the destination space. This option is not available if color management is turned off. Whether the profile is included or not is determined by the Profile Inclusion Policy.

Converts all colors to the profile selected for Destination. Specifies the characterized printing condition for the document. The available options depend on whether color management is on or off. For example, if color management is off, the menu lists available printer profiles.

If color management is on, the menu lists the same profile selected for Destination Profile provided it is a CMYK output device , in addition to other predefined printer profiles. Describes the intended printing condition.

This entry can be useful for the intended receiver of the PDF document. A pointer to more information on the intended printing condition. The identifier is automatically entered for printing conditions that are included in the ICC registry. Indicates the web address for more information on the registry. Indicates the state of trapping in the document. For instance, if a font contains 1, characters but the document only uses 10 of those characters, you may decide that embedding the font is not worth the extra file size.

Specifies how to save overlapping colors that are set to overprint. You can choose to preserve the overprinting or discard the overprinting.

Alternately, click Custom to customize the flattener settings. Note: Acrobat 5 PDF 1. As a result, the Preset and Custom options are not available for these levels of compatibility.

When saving as PDF, you can add password protection and security restrictions, limiting not only who can open the file, but also who can copy or extract contents, print the document, and more.

A PDF file can require passwords to open a document document open password and to change security settings permissions password.

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imresize with bicubic DOWNsampling

In mathematics , bicubic interpolation is an extension of cubic interpolation for interpolating data points on a two-dimensional regular grid. The interpolated surface is smoother than corresponding surfaces obtained by bilinear interpolation or nearest-neighbor interpolation. Bicubic interpolation can be accomplished using either Lagrange polynomials , cubic splines , or cubic convolution algorithm. In image processing , bicubic interpolation is often chosen over bilinear or nearest-neighbor interpolation in image resampling , when speed is not an issue.

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Bicubic interpolation

Adobe PDF options are divided into categories. Changing any option causes the name of the preset to change to Custom. The categories are listed on the left side of the Save Adobe PDF dialog box, with the exception of the Standard and Compatibility options, which are at the top of the dialog box. Specifies if artwork should be compressed and downsampled, and if so, which method and settings to use. Although the options are the same as in the Print dialog box, the calculations are subtly different because PDF is not output to a known page size. Displays a summary of the current PDF settings.

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