Press the Format... button when exporting PDF content and click on the Image tab
When image output is enabled in the General format tab, Infix produces copies of all images stored in the PDF.
The options in this tab are mainly concerned with the scaling or size of the images output.
Infix can deal with two types of image in PDF: vector illustrations consisting of lines, curves, filled areas and bitmap images or photographs made up of many coloured pixels.
Infix cannot output vector formats directly but will instead convert any such illustrations into a bitmap format by a process called rasterization.
- Auto-identify vector artwork
Many PDF documents may contain vector artwork or line-art. However, due to the nature of PDF, it is not always possible for a computer program to determine where on a page such artwork occurs since each page is stored as a general mix of text, images and line-art.
Infix is capable to an extent, of identifying such artwork on a page. Selecting this option will cause Infix to automatically convert vector artwork in the original into images in the output format selected.
If you are unsure if an graphic is an image or vector-artwork, see Exporting graphics
If you encounter problems with illustrations not being correctly identified, use the Hyperlink tool to mark them up with Image Box links. See Exporting images.
Infix can only output images in bitmap formats not vector graphics formats. If images do not appear in your final output documents, try turning this option on or placing an image box around the missing images.
- Use original OPI name if available
If your PDF contains OPI placement information for the images within it, Infix will use the original filename for images it exports.
You can check if an image has associated OPI information by selected the image with the object tool, then click the right mouse button and choose Image Properties...
This set of options allows you to set the output scaling of the images that Infix extracts from a PDF.
When disabled, images are output as they are found in the PDF. This may give very large images since many PDF documents contain high-resolution versions of an image which are then scaled by the PDF viewer to the correct size.
- Fix image resolution at:
This option scales output images so that they are all at the same resolution in dpi (dots per inch). Resolutions available are: 72, 100, 150, 300, 400, 600, 720, 800 and 1200 dpi.
This setting is particularly important when rendering vector artwork.
- Advanced Scaling Pop-up
Three types of advanced scaling can be selected from the drop down menu. For each kind of scaling, if either width or height is set to zero, then an image’s aspect ratio is maintained.
- Set image size
Enables exact image sizes to be specified in pixels. Images will be sub-sampled or expanded accordingly.
- Maximum size
Enables a maximum image size to be specified. If an image is smaller than the width and height values given then the scaling is unchanged. When Max scaling occurs, the aspect ratio is maintained. So, for example an image which is 800 by 400 when output at a Max of 200 by 200 will be rendered as 200 by 100 - the shape of the image is maintained.
Will resize images according to a percentage value.
- Colour depth to use when rendering
This pop-up tell Infix how to render any marked-up regions during export. It also controls how pages are rendered if the Convert each page into an image option is enabled in the General tab. It has no affect on the export of non-rendered images such as photos - these are, in most cases, output with the colour depth at which they are stored in the PDF.
You can determine the colour depth of images stored in a PDF by clicking on an image using the object select tool, then choosing Object->Image->Properties...