When exporting your PDF file (File | Export | Pages as), click on the Format button and switch to the Image tab.
If, on the General tab, you have selected the option Image Output, FlexiPDF will export all images of the PDF file.
The settings on the Image tab mainly refer to the scaling and size of the output image files.
FlexiPDF can export two types of images: pictures (photographs consisting of many color pixels) and drawings (consisting of vector graphics with lines, curves and filled areas). FlexiPDF cannot output the vectors of drawings as such, thus it rasterizes such illustrations for export.
The option "Auto-identify vector artwork"
Many PDF files contain vector graphics. Due to the internal structure of PDF files, however, FlexiPDF cannot always recognize them automatically, as each page is a mixture of text, images and vector drawings.
FlexiPDF can automatically find vector graphics on the page to some extent. If you enable the option Auto-identify vector artwork, FlexiPDF will export them to the image format that was set.
If you are unsure whether a document contains vector graphics or images, enlarge the view of the pages. If the display now becomes grainy or "pixelated", the objects are images. If the display remains sharp and detailed, they are vector graphics.
If you notice that certain vector graphics are not being correctly identified when exporting, you should use the Hyperlink tool to mark them as FlexiPDF Image Box. (For more information, see Marking illustrations for export).
Vector graphics are always exported by FlexiPDF as pixel graphics (raster graphics).
The option "Use original OPI name if available"
If your PDF file has OPI placement information for the images it contains, FlexiPDF uses the original file names of the images when exporting them.
You can check whether an image has OPI placement information by selecting it with the Object tool, right-clicking on it to open the context menu and selecting Image 
Properties there.
Image Scaling section
Here, you can specify the scaling of the exported images.
If no check mark is set for Image Scaling, the images will be output in the size in which they are in the PDF file. This can lead to very large files, as many PDF documents contain high-resolution images that are scaled down by the PDF viewer only for the screen display.
▪Fix image resolution at
| This option scales the output images so that they all have the same resolution in dpi (dots per inch). Available resolutions include 72, 100, 150, 300, 400, 600, 720, 800 and 1200 dpi. |
| This setting is particularly important when exporting vector graphics. The higher the image resolution, the sharper the output image will be. |
▪Advanced scaling options
| You can select three types of (advanced) image scaling from a dropdown list. The following applies for each type: If you set the height or width to 0, the aspect ratio of height and width of the images will be maintained. |
| Set image size: This option sets the exact image size in the specified pixels. |
| Max. image size: This option sets the maximum image size in the specified pixels. If an image is smaller than the specified height and width, it is output in its original size. Otherwise, it is resized accordingly to the selected maximum values, while maintaining the aspect ratio of height to width. For example, an image with a size of 800 x 400 pixels and a specified maximum image size of 200 x 200 pixels will be rendered in a resolution of 200 x 100 to preserve the aspect ratio of the image. |
| Scale image: This option resizes the images to the specified percentages. |
The option "Colour depth when rendering"
This dropdown list enables you to specify the color system in which FlexiPDF renders the areas identified as FlexiPDF Image Box when exporting vector graphics (see above: inserted drawings). This option also specifies the color system in which pages are exported as image files if the option Convert each page into an image is enabled on the General tab.
The option has no effect on non-rendered images (such as photos). They are exported with the color depth in which they are stored in the PDF file.
You can view the color depth of images saved in the PDF by using the Object tool to click on an image. Then choose the ribbon command Format | group Image | Properties.