Custom image and DNG

[miles500]

Inadvertently I must have pressed a few wrong buttons and ended up with some of my photos having bleach bypass applied to them. Initially they looked awful when viewed on my monitor but after a few seconds the embedded JPEG gave way to the RAW DNG and all looked well - until I tried to print and then I got a dreadful green cast. After some hours of checking the printer out and using other programs, I came to the conclusion that the bleach bypass info was retained in the RAW file even though it looked fine on the monitor. To test this out I reprocessed the DNG in camera to convert to the normal bright setting and saved to JPEG and this time I could print again without the cast, although it took a lot of tweaking to get anything like the result I wanted.

Anyway here it is:




Storm over Portsmouth Harbour



Went there to see USS Theodore Roosevelt which was a long way out and too big for the harbour.





Not entirely happy with it so far but you can see a lot more here than you could with the naked eye. It is 4 or 5 images joined together.



Miles







--
Miles500

 

[James O'Neill]

Inadvertently I must have pressed a few wrong buttons and ended up with some of my photos having bleach bypass applied to them. Initially they looked awful when viewed on my monitor but after a few seconds the embedded JPEG gave way to the RAW DNG and all looked well - until I tried to print and then I got a dreadful green cast. After some hours of checking the printer out and using other programs, I came to the conclusion that the bleach bypass info was retained in the RAW file even though it looked fine on the monitor. To test this out I reprocessed the DNG in camera to convert to the normal bright setting and saved to JPEG and this time I could print again without the cast, although it took a lot of tweaking to get anything like the result I wanted.

Because I do a lot in B&W I have my camera set to RAW, put the B&W effect on (only a couple along from bleach bypass). I have a light room preset to give me the effect I see on the preview, but light room always takes me back to colour and "normal" settings. Depending on what software you have it may read what you've got set in the camera and make that the starting point.

 

[Jim in Hudson]

What software did you use for processing the DNG and subsequently printing?

 

[DrewE]

What software did you use for processing the DNG and subsequently printing?

My question as well.

It sounds as though whatever you used to print just printed the JPG preview image from the DNG, which has the in-camera processing applied. The DNG itself has all the data from the sensor, and metadata indicating what the camera settings were, which may or may not be used as a starting point for the RAW processing, depending on what program you use to process the RAW.

 

[miles500]

What software did you use for processing the DNG and subsequently printing?

I have been using ACDSee pro 8 and I was always under the impression that when it opened a DNG, it initially read the embedded JPEG which appears for a few seconds. The RAW file then appears and I have usually printed directly from that, believing that I was printing from the RAW data and not an embedded JPEG and I think this must be so as the embedded JPEG is ( I think) very small and I would not be getting the quality ( printing to A3) that I am used to getting from an embedded JPEG. It is my theory that some of that custom image info ( in this case the unwanted bleach bypass data) remains with the DNG and is recognised by the print part of the program but not the viewing part.

 

[miles500]

Inadvertently I must have pressed a few wrong buttons and ended up with some of my photos having bleach bypass applied to them. Initially they looked awful when viewed on my monitor but after a few seconds the embedded JPEG gave way to the RAW DNG and all looked well - until I tried to print and then I got a dreadful green cast. After some hours of checking the printer out and using other programs, I came to the conclusion that the bleach bypass info was retained in the RAW file even though it looked fine on the monitor. To test this out I reprocessed the DNG in camera to convert to the normal bright setting and saved to JPEG and this time I could print again without the cast, although it took a lot of tweaking to get anything like the result I wanted.

Because I do a lot in B&W I have my camera set to RAW, put the B&W effect on (only a couple along from bleach bypass). I have a light room preset to give me the effect I see on the preview, but light room always takes me back to colour and "normal" settings. Depending on what software you have it may read what you've got set in the camera and make that the starting point.

I fear you may be right. I have used ACDSee for some years because it is really easy to use, but it is prone to bugs and this may well be one of them, unless of course it has to do with algorithm within the camera. However I am not conversant with the intricacies of programming, but I have found the whole thing very odd as I had always understood that filters were applied only to JPEGS and not to RAW, but it does not appear to be a simple as that.

I wish the custom image settings were a little less easy to access so that accidents like this might be avoided!

 

[miles500]

A final word on this - as can be seen above there is no real green cast on the sky of the Portsmouth Harbour picture, but after innumerable abortive attempts I have not found it possible to print without a green sky - even when the original image is converted in Adobe Camera Raw. I tried desaturating the sky so it was entirely grey on the screen, yet the print still came out greenish. I did the same on a file which had never been contaminated by the bleach bypass filter and the printer had no problem in delivering a grey sky. Of course I also tried to eliminate the problem by using the Pentax utility and again no luck!

My conclusion is that once a custom filter has been applied, you can eliminate it for viewing on a monitor but not for printing. I can offer no explanation as to how my K3 came to be reset to bleach bypass with green toning, other than that my fingers must have slipped across the four way control button as he changed lenses or placed or took out from my bag!

 

[JNR]

What software did you use for processing the DNG and subsequently printing?

I have been using ACDSee pro 8 and I was always under the impression that when it opened a DNG, it initially read the embedded JPEG which appears for a few seconds. The RAW file then appears and I have usually printed directly from that, believing that I was printing from the RAW data and not an embedded JPEG and I think this must be so as the embedded JPEG is ( I think) very small and I would not be getting the quality ( printing to A3) that I am used to getting from an embedded JPEG. It is my theory that some of that custom image info ( in this case the unwanted bleach bypass data) remains with the DNG and is recognised by the print part of the program but not the viewing part.

 

[miles500]

What software did you use for processing the DNG and subsequently printing?

I have been using ACDSee pro 8 and I was always under the impression that when it opened a DNG, it initially read the embedded JPEG which appears for a few seconds. The RAW file then appears and I have usually printed directly from that, believing that I was printing from the RAW data and not an embedded JPEG and I think this must be so as the embedded JPEG is ( I think) very small and I would not be getting the quality ( printing to A3) that I am used to getting from an embedded JPEG. It is my theory that some of that custom image info ( in this case the unwanted bleach bypass data) remains with the DNG and is recognised by the print part of the program but not the viewing part.

 

[JNR]

You can download Adobe DNG converter for free. If you run the Pentax DNG through the converter you should end up with a totally unbaked DNG. That's worth a try...

 

[JNR]

So frustrating! Not sure if Express (7?) supported through the K-3. Will mention that I was an LR user until C1 put out v8 - huge step up unlike the minor changes in versions 5-7.

Good luck in resolving the darn thing. So much for the idea that DNG is truly DNG.

 

[Barry Pearson]

Inadvertently I must have pressed a few wrong buttons and ended up with some of my photos having bleach bypass applied to them. Initially they looked awful when viewed on my monitor but after a few seconds the embedded JPEG gave way to the RAW DNG and all looked well - until I tried to print and then I got a dreadful green cast. After some hours of checking the printer out and using other programs, I came to the conclusion that the bleach bypass info was retained in the RAW file even though it looked fine on the monitor. To test this out I reprocessed the DNG in camera to convert to the normal bright setting and saved to JPEG and this time I could print again without the cast, although it took a lot of tweaking to get anything like the result I wanted.

Can you make the DNG available for download?

Then I can poke around inside it to see if I can spot what is going on.

 

[miles500]

Inadvertently I must have pressed a few wrong buttons and ended up with some of my photos having bleach bypass applied to them. Initially they looked awful when viewed on my monitor but after a few seconds the embedded JPEG gave way to the RAW DNG and all looked well - until I tried to print and then I got a dreadful green cast. After some hours of checking the printer out and using other programs, I came to the conclusion that the bleach bypass info was retained in the RAW file even though it looked fine on the monitor. To test this out I reprocessed the DNG in camera to convert to the normal bright setting and saved to JPEG and this time I could print again without the cast, although it took a lot of tweaking to get anything like the result I wanted.

Can you make the DNG available for download?

Then I can poke around inside it to see if I can spot what is going on.

 

[miles500]

So frustrating! Not sure if Express (7?) supported through the K-3. Will mention that I was an LR user until C1 put out v8 - huge step up unlike the minor changes in versions 5-7.

Good luck in resolving the darn thing. So much for the idea that DNG is truly DNG.

 

[awaldram]

Inadvertently I must have pressed a few wrong buttons and ended up with some of my photos having bleach bypass applied to them. Initially they looked awful when viewed on my monitor but after a few seconds the embedded JPEG gave way to the RAW DNG and all looked well - until I tried to print and then I got a dreadful green cast. After some hours of checking the printer out and using other programs, I came to the conclusion that the bleach bypass info was retained in the RAW file even though it looked fine on the monitor. To test this out I reprocessed the DNG in camera to convert to the normal bright setting and saved to JPEG and this time I could print again without the cast, although it took a lot of tweaking to get anything like the result I wanted.

Can you make the DNG available for download?

Then I can poke around inside it to see if I can spot what is going on.

 

[Barry Pearson]

Inadvertently I must have pressed a few wrong buttons and ended up with some of my photos having bleach bypass applied to them. Initially they looked awful when viewed on my monitor but after a few seconds the embedded JPEG gave way to the RAW DNG and all looked well - until I tried to print and then I got a dreadful green cast. After some hours of checking the printer out and using other programs, I came to the conclusion that the bleach bypass info was retained in the RAW file even though it looked fine on the monitor. To test this out I reprocessed the DNG in camera to convert to the normal bright setting and saved to JPEG and this time I could print again without the cast, although it took a lot of tweaking to get anything like the result I wanted.

Can you make the DNG available for download?

Then I can poke around inside it to see if I can spot what is going on.

Hi Barry,

This is a dropbox link to the original Pentax DNG file.

I think that the DNG converter has solved the problem, but it would be useful to know whether there is any information which governs printing and which relates to the custom image and which sticks to the file despite changing back to natural either in camera or by using the Pentax utility.

https://www.dropbox.com/s/n15gpvfzdoh8wpm/IMGP9211.DNG?dl=0

That appears to have been through some adobe product as it profiled as process version 2012 which the k3 doesn't do.

Process versions are not a DNG concept. They are an ACR and Lightroom concept. (When I imported it into Lightroom with neutral parameters, it ended up as process version 2010).

 

[Barry Pearson]

Inadvertently I must have pressed a few wrong buttons and ended up with some of my photos having bleach bypass applied to them. Initially they looked awful when viewed on my monitor but after a few seconds the embedded JPEG gave way to the RAW DNG and all looked well - until I tried to print and then I got a dreadful green cast. After some hours of checking the printer out and using other programs, I came to the conclusion that the bleach bypass info was retained in the RAW file even though it looked fine on the monitor. To test this out I reprocessed the DNG in camera to convert to the normal bright setting and saved to JPEG and this time I could print again without the cast, although it took a lot of tweaking to get anything like the result I wanted.

Can you make the DNG available for download?

Then I can poke around inside it to see if I can spot what is going on.

Hi Barry,

This is a dropbox link to the original Pentax DNG file.

I think that the DNG converter has solved the problem, but it would be useful to know whether there is any information which governs printing and which relates to the custom image and which sticks to the file despite changing back to natural either in camera or by using the Pentax utility.

I'm a bit slow here. I've left some of my tools on my old PC, so I've had to re-download the DNG SDK to have a look inside the DNG. (The SDK includes a command-line program called dng_validate.exe which I've found very useful over many years for looking inside DNG and other files without getting to the hex/binary level).

I've compared your DNG with a DNG of my own from a K-3. (At the same firmware version 1.11). Yours doesn't look like a DNG straight from the camera. It has quite a bit of extra XMP metadata, as though it has been through one or both of Lightroom or ACR. (ACR 7.4?)

I'm not clear what the history of the DNG is. What does "original Pentax DNG file" mean?

 

[Model Mike]

https://www.dropbox.com/s/n15gpvfzdoh8wpm/IMGP9211.DNG?dl=0

--
Miles500

Just tried importing the image into Lightroom, whilst monitoring the preview in FastStone.

[update]

Choosing "Update JPEG preview and Save Metadata" in LR seemed at first to fix it, but FastStone can't extract the preview from the amended DNG.

--

Mike
http://flickr.com/rc-soar

 

[brew1brew]

Miles, I processed it with Silkypix 6 pro. used

WB - cloudy

contrast - a little strong

color - V2

you can download it from my smugmug if you want to try to print it. but I do see a slight green ting when viewing the original PNG and not with the JPG from Silkypix.

--
Les
anthisphoto.smugmug.com

 

[miles500]

Inadvertently I must have pressed a few wrong buttons and ended up with some of my photos having bleach bypass applied to them. Initially they looked awful when viewed on my monitor but after a few seconds the embedded JPEG gave way to the RAW DNG and all looked well - until I tried to print and then I got a dreadful green cast. After some hours of checking the printer out and using other programs, I came to the conclusion that the bleach bypass info was retained in the RAW file even though it looked fine on the monitor. To test this out I reprocessed the DNG in camera to convert to the normal bright setting and saved to JPEG and this time I could print again without the cast, although it took a lot of tweaking to get anything like the result I wanted.

Can you make the DNG available for download?

Then I can poke around inside it to see if I can spot what is going on.