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Diffstat (limited to 'docs/topics/images.rst')
| -rw-r--r-- | docs/topics/images.rst | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/docs/topics/images.rst b/docs/topics/images.rst index 042609c..19ec2e8 100644 --- a/docs/topics/images.rst +++ b/docs/topics/images.rst @@ -69,7 +69,8 @@ Extracting images Extracting images is straightforward. :meth:`~pikepdf.PdfImage.extract_to` will extract images to a specified file prefix. The extension is determined while extracting and appended to the filename. Where possible, ``extract_to`` -writes compressed data directly to the stream without transcoding. +writes compressed data directly to the stream without transcoding. (Transcoding +lossy formats like JPEG can reduce their quality.) .. ipython:: :verbatim: @@ -80,7 +81,7 @@ writes compressed data directly to the stream without transcoding. It also possible to extract to a writable Python stream using ``.extract_to(stream=...`)``. -You can also retrieve the image as a Pillow image: +You can also retrieve the image as a Pillow image (this will transcode): .. ipython:: @@ -88,9 +89,9 @@ You can also retrieve the image as a Pillow image: Another way to view the image is using Pillow's ``Image.show()`` method. -Not all images can be extracted. Also, some PDFs describe an image with a +Not all image types can be extracted. Also, some PDFs describe an image with a mask, with transparency effects. pikepdf can only extract the images -themselves, not rasterize them exactly as they appear in a PDF viewer. In +themselves, not rasterize them exactly as they would appear in a PDF viewer. In the vast majority of cases, however, the image can be extracted as it appears. .. note:: |