That options are available at top of Import & processing properties window and Image Placeholder properties frame.
This tab is enabled if you selected object in your project that is going to be a placeholder (bounding box) for future image place (import or paste into). This menu is not active when selected object is type of text. Krasbit Layouter lets you prepare a reusable template having reserved areas (placeholders) where user is going to place an image later. That reserved area will automatically set location, size, effects and may use different algorithms to fit placed image into that placeholder when imported image have different size and aspect ratio than reserved placeholder object. You will control all the future placement of image at this menu. You can scale, stretch, crop,mirror, perspective, displace map distort or no resize at all. Some options are available only to placeholders that are vector objects (crop, scale and crop, perspective). In most of cases, you should use a rectangle objects as placeholders. Here are available image placeholder properties.
keep rotation
If checkbox is selected and placeholder in your template has got any rotation already 
, then image that will place into the placeholder in future will respect this and also rotate to exactly same degree. This is useful if you are preparing multiple placeholders on template for same image (Batch Import or photo tiles), but you want some of them to print on landscape and the other copy on portrait orientation. Other use case is when you need print image flipped for some reason (sublimation by example) In that case you will get this effect if you prepare placeholder by put (minus) sign on one of horizontal or vertical scale input on your workspace toolbar
On enter, your object details minus sign dissapear and rotation will show as 180 degrees
Your placeholder is ready to flip any placed image now.
keep effects
If this option is checked then the content which is being imported or pasted to bounding box of the target shape will automatically get the effects like shadow and transparency from the target shape.
Preserve target object (placeholder)
That options matters mostly for scale-like alignment modes. If this option is checked then the placeholder (source of bounding box where the content is being imported or pasted) won’t be deleted after the operation. You may only delete placeholders that are not based on powerclips (no scale, scale to object, ignore aspect ratio, perspective). Any placeholder that got “Crop” word in the alignment mode cannot be deleted as it will contain placement image inside internal powerclip’s content (preserve target option will make a copy of placeholder frame in that case). It's up to you design whatever you would to keep the original placeholder object after image is placed. If you expect frequent updates of imported images in same template, you should consider to check this option.
external linking
This option is enabling (if checked) or disabling the external linking of being imported images by Krasbit Layouter macros. When bitmap is externally linked, then a low resolution copy of the source bitmap is placed on the stage. Using this technique improves the performance while working on the project and also significantly reduces the saved file size. But you must remember, that when you export pages with externally linked images they will be low-res until they had been resolved. It concerns to all export file formats except PDF.
Resolving of external bitmaps is reverse process to the external linking. When the bitmap link is being resolved, then the low-res copy of bitmap in the project is replaced by original high resolution image.
When you use the standard CorelDRAW® Resolve command (available on Link manager window) then you won't be able to restore that link again cause all information about the source file will be cleared. In contrast to CorelDRAW way of handling with external bitmap, if you import bitmap via KrasbitLayouter macros, then you will be able to resolve or restore link to bitmap every time, regardless if it was already resolved.
Macros will add some extra information about the source to being imported bitmaps. That informations will not be deleted in case of links resolving. Moreover, they enabled to check for bitmap updates or make it externally linked even if it wasn't linked before! Macro Layouter.resolveLink (detailed in another chapter) can also fix another drawback of native CorelDRAW® Resolve command when aspect ratio of being resolved bitmap have been changed since last update operation.
When you export project including externally linked bitmaps to PDF, then CorelDRAW®automatically resolve that bitmaps on every export. This process can take a lot of time, especially in case of large source bitmaps and is done on every time, even if you wanted export PDF only for project review. Another drawback of resolving bitmaps while PDF exporting is that disproportionately stretching occur after the sources have been externally updated and have changed theirs aspect ratio. So it is recommended to resolve all bitmaps links manually by using macros when the project is finished before outputting PDF file.
WHEN YOU SHOULD USE EXTERNAL LINKING?
- If your project will be containing or already have a large number of high resolution images and its size still growing.
- If you want improve performance while editing projects which embedding high resolution bitmaps.