Let me asume you imported the image from a jpeg file to display it in the
Area of a
Shape. To do so you had to use the
I do not know the technical details about the rendering of the image for the display or for prints. However, the original file will be embedded in the Writer document without converting it, and you can reshape(°) it for the area of the mentioned
Shape later-on without having lost any information contained in the jpeg. You can even extract the jpeg again from the file to which the document was saved. (I do not know an export option offered by LibO itself, but would have to open the compressed file with an archive tool.)
(°) reshape: Use all the options offered in the
Area > Bitmap tab. It should work independent of the previous settings.
Edit1 (regarding the comment below):
Being rendered for the screen or for output on a printer any image will be converted to a description of many, many little dots of coloured dirt or something alike. Even if printing a vector graphic on a vector printer there will mostly be a simiar conversion by the printer. I do not know a recent example of an x-y-plotter actually drawing lines. This is another part of general digitaisation, probably. I thus don’t understand your insisting on the “bitmap pattern”.
In my understanding the label ‘Bitmap’ on the button for the respective Area option is simply inapt. Users may misunderstand it for something like
.bmp. However, many graphical formats can be imported and will be embedded into he document then without a loss of quality. If you resize a shape having taken an image later, you will most likely need to open the Area/Bitmap dialogue another time and apply one of the choices to scale / fit it as wanted.
To demonstrate to more detail what I want to explain I created a few documents. Containing images they are too big for an upload her. Thus I put them to this location in my own domain to make them available for you. In specific regard, please, that my original big image and the
.jpg I extracted later from the file
ask149548TextAndShapeWithImageMedaillonAndRectangle.odt are bitwise identical.