Thank you RAWR,
Originally posted by rawr ...DNG, like PEF, has built in JPG previews. Maybe it uses them. Without knowing more about FPVC, perhaps the RAW convertor they employ (dcraw?) is just very efficient and also kept up to date?
DNG created with AdobeDNGConverter v7.1 have
not always previews. They can have no, medium or full preview. In my case with 4928x3264 images from K-30 I just converted the Pentax DNG with AdobeDNGConverter in three addtional AdobeDNG files. As far as I know, this does not make sense from RAW point of view. But the preview is modified as configured (either no preview, or with 1024x678 medium or with 4928x3264 full dimension in my case).
Please see below a screenshot from Win7 FIlemanager (ExtraLargeIcon View). Of course the DNGs are displayed only because of FastPictureViewerCodec v3.3.0.66. But you see the difference of AdobeDNGs with or without preview. Even without preview FPVC is able to display a thumbnail, which is just a little bit darker than the other thumbnails.
For original image files see:
www.ey-com.de/captureone/k-30/
I will number the pictures in my following text with 1-2-3 (first row) and 4-5-6 (second row)
You can identify the cropping well on the left side of imag
es (where the red X marks the small car)
If you open the files for example with Irfanview 4.33 you detect the following:
- This is just again the image visible or exported with CaptureOne v6.4.3. Bad as reported but no cropping. Of course C1 displays such bad color also for AdobeDNG images 4-6, because the preview is not used for display or conversion.
- This is the original Pentax DNG. Note the cropping. Dimensions are 4928x3264
- This is the original Pentax DNG. Looks fully identical to "2". Dimensions are 4928x3264
- This AdobeDNG is a little bit darker. No cropping. Dimensions are 4928x3264
- This AdobeDNG does look identical to "4", but with lower resolution. Dimensions are 1024x678.
- This AdobeDNG is even more darker. Dimension are 2468x1636 (?). Don't know how this preview is generated in WIndows/FPVC and Irfanview.
The variations of cropping and dimensions (4960x3300, 4936x3272 or 4928x3264 in my case) among various other tools are a little bit confusing but perhaps not really relevant.
More important is the color and with a couple of tools (IDimager, Irfanview, FPVC, ...) I have the impression, that they display Pentax DNG
and convert to JPG quite properly. And this without any update! I cannot imaging that all tools without CaptureOne are prepared for Pentax K-30 DNGs. There must be some other reason.