Adobe Acrobat Portable Document Format .PDF is a file format used for document exchange. PDF is used for representing two-dimensional documents. PDF was created by Adobe Systems. The vector .PDF export supports solid pattern, image, and gradient patterns.
When a map with a defined coordinate system is exported to a vector PDF file format, a GeoPDF file is created. The scaling source for the GeoPDF is changed on the Scaling tab in the Export Options dialog.
Use a vector .PDF to export the vector objects in the project (lines and text) as vector objects in the PDF. This makes the objects clear and sharp. Vector objects do not lose quality when you zoom in. It doesn't matter how much you zoom in, the line and text will always look crisp.
When possible, text fonts are embedded in vector PDF files. The text in the exported PDF will match the text in the Strater file. Sometimes the font cannot be embedded in the PDF. When that is the case, a different font will be substituted for the text.
The images in your project will also export as images in the vector .PDF. Vector .PDF files are smaller than Raster .PDF files and are usually higher quality. The drawback is that some fill patterns and transparency are not supported, so the output may not look exactly the same as your original project.
Objects that are transparent or partially transparent in Strater are exported with the transparency enabled in the .PDF. There is one instance when the resulting Vector PDF appears different from the Strater plot. When the nodes in a colormap have differing opacity, set in the Colormap Editor dialog, a single average opacity is used in the exported Vector PDF.
When using the File | Export | Graphic command to export to a vector .PDF file, the Export Options dialog allows you to specify the PDF options.
Specify Vector PDF options in the Export Options dialog.
The Resize embedded images to less than option specifies the size in megabites that an embedding image is resized to during export. Enter a value in the MB box. If an exported image exceeds this size, its resolution will be reduced so it doesn’t exceed the designated maximum size. Increase this value to get better looking images at the expense of larger export files.
As long as there is no shear, perspective, or clipping, PDF text entities will be exported as text. This means that the PDF text entities will be sized and oriented similar to the text objects in the application document. When shear, perspective, or clipping occur, the text is exported as solid polygons. Shear occurs when the character glyphs are not perpendicular to the text baseline. Perspective occurs when the height of glyphs in the text string are not all the same, as in a 3-D view where the glyphs are smaller the farther they are from the observer. Clipping occurs when part of the text object is partially inside and partially outside the map limits.
The Page Options section controls the page size in the exported .PDF file. Select the Use application page size (if available) to use the paper size defined in the Page Setup dialog. If Fit page around exported objects is selected, the page size in the .PDF file will be only as large as the objects being exported.
When the Use application page size (if available) is selected and objects extend beyond the page defined in the Page Setup dialog, the objects are clipped and not displayed in the PDF file.
The Compression Options section contains options that can make the PDF file size smaller.
Check the box next to Compress images to apply .PDF compression to the images in the .PDF file. This produces smaller vector .PDF files with no loss in quality. When this option is unchecked, .PDF files will be larger.
Check the box next to Compress pages to apply .PDF compression to the entire page stream. This produces significantly smaller vector .PDF files with no loss in quality. When this option is unchecked, .PDF files will be larger.
Check the box next to Embed fonts (when available) to store the fonts inside the .PDF file. This produces a larger vector .PDF file, but the font in the .PDF file will exactly match the font in the Strater file. When this option is unchecked, the .PDF file will be smaller, but the text may not appear the same in the .PDF file as it does in the Strater file. Some fonts cannot be embedded. A different font is substituted when this is the case.
Strater uses bilinear interpolation to smooth the display of reduced large images and enlarged small images. Adobe Reader uses bilinear interpolation to smooth the display of a reduced large image, however it does not smooth the display when enlarging small images. Therefore some small images may appear "blocky" in a PDF output when compared to the display in the Strater program.
Click the Smooth small images ( PDF file may be larger) check box to smooth small images in the output PDF file. The Smooth small images option uses bilinear interpolation to upscale images less than 1MB by 2x, 4x, or 8x its original size up to, but not greater than, 1MB.
Click the Defaults button to return the options to the default values. The default value of Resize embedded images to less than option is 10MB.
See the Scaling Page for details.
Adobe Acrobat .PDF File Description
PDF Import Options Dialog
PDF Raster Export Options Dialog