K-5 Poor quality of embedded JPEG

drougge · 11-10-2010, 03:46 PM

If I extract the jpeg I still have two files. I wouldn't normally do that, since I just want to look at the image, which I can do anyway.

falconeye · 11-10-2010, 06:41 PM

Originally posted by boardhead

makes it even more surprising that they don't give you any control over the quality of this image.

boardhead, I can imagine situations where you want better quality embedded JPGs, like when using certain image archiving software.

For the current situation, how large is the PEF and how large is the embedded JPG after extraction in DCU?

I assume there must be rewriting software which touches all raws in a folder and rewrites the embedded JPGs with better quality versions. At least for DNG. Did you check? AFAIK, one could even use LR to do just that, incl. a conversion of PEF with low quality JPG to DNG with high quality JPG.

As for a firmware option, it would be hard to convince Pentax that there is enough demand for it. But of course, it would be nice to be able to tweak raw file size, incl. an option to control embedded JPG size and bit depth. Starting at 24MP, even an option for reduced size raw files (6MP sRAW) or lossy compressed raw will probably become interesting.

boardhead · 11-11-2010, 07:32 AM

Originally posted by falconeye

boardhead, I can imagine situations where you want For the current situation, how large is the PEF and how large is the embedded JPG after extraction in DCU?

The PEF is in the range of 20 MB, and the embedded JPEG is just over 1 MB of this. I don't want a super-resolution embedded JPEG, probably something around 3-4 MB would be just fine for me.

Quote:

I assume there must be rewriting software which touches all raws in a folder and rewrites the embedded JPGs with better quality versions. At least for DNG. Did you check? AFAIK, one could even use LR to do just that, incl. a conversion of PEF with low quality JPG to DNG with high quality JPG.

Yes, I could do this, but it is an additional processing step. I am always suspicious of the Adobe DNG converter because it is known to corrupt metadata when converting some types of images, so I would have to do lots of testing before implementing something like this.

- Phil

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Poor upload Image Quality	TGregory	Site Suggestions and Help	13	11-09-2011 10:09 PM
Help...Very Poor Video Quality	JesseY	Video Recording and Processing	5	12-20-2009 12:08 PM
Does WB temp setting get embedded in jpeg/exif?	wasim_altaf	Troubleshooting and Beginner Help	8	09-17-2009 03:27 PM
Poor Quality Photographs	elvis35to05	Photographic Technique	11	01-02-2009 10:12 AM
RAW + JPEG with JPEG on One Star quality	laissezfaire	Pentax DSLR Discussion	58	12-10-2008 02:42 PM

11-10-2010, 03:46 PM	#16
drougge Veteran Member Join Date: Jan 2010 Location: Malmö Photos: Gallery Posts: 787	If I extract the jpeg I still have two files. I wouldn't normally do that, since I just want to look at the image, which I can do anyway.

11-10-2010, 06:41 PM	#17
falconeye Veteran Member Join Date: Jan 2008 Location: Munich, Alps, Germany Photos: Gallery Posts: 6,871	Originally posted by boardhead makes it even more surprising that they don't give you any control over the quality of this image. boardhead, I can imagine situations where you want better quality embedded JPGs, like when using certain image archiving software. For the current situation, how large is the PEF and how large is the embedded JPG after extraction in DCU? I assume there must be rewriting software which touches all raws in a folder and rewrites the embedded JPGs with better quality versions. At least for DNG. Did you check? AFAIK, one could even use LR to do just that, incl. a conversion of PEF with low quality JPG to DNG with high quality JPG. As for a firmware option, it would be hard to convince Pentax that there is enough demand for it. But of course, it would be nice to be able to tweak raw file size, incl. an option to control embedded JPG size and bit depth. Starting at 24MP, even an option for reduced size raw files (6MP sRAW) or lossy compressed raw will probably become interesting.

11-11-2010, 07:32 AM	#18
boardhead Forum Member Join Date: Feb 2009 Location: Canada Posts: 58 Original Poster	Originally posted by falconeye boardhead, I can imagine situations where you want For the current situation, how large is the PEF and how large is the embedded JPG after extraction in DCU? The PEF is in the range of 20 MB, and the embedded JPEG is just over 1 MB of this. I don't want a super-resolution embedded JPEG, probably something around 3-4 MB would be just fine for me. Quote: I assume there must be rewriting software which touches all raws in a folder and rewrites the embedded JPGs with better quality versions. At least for DNG. Did you check? AFAIK, one could even use LR to do just that, incl. a conversion of PEF with low quality JPG to DNG with high quality JPG. Yes, I could do this, but it is an additional processing step. I am always suspicious of the Adobe DNG converter because it is known to corrupt metadata when converting some types of images, so I would have to do lots of testing before implementing something like this. - Phil