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Author Topic: Difficulties with Canon raw files  (Read 5004 times)
Sandy
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« on: December 01, 2013, 09:15:16 PM »

The photographers for the wedding of my daughter (friends of the couple's and professionals) don't do printing and sent me the raw files (as well as the jpegs).  They used Canon 5D and 6D.  I've adjusted and printed a small number from the raw.  This worked well.  It would wouldn't it when you use Qimage.  However, I wanted to copy some adjusted photos to the couple (via WeTransfer) so they could check on whether the cropping and sizing suited, so it made sense to put them in sRGB.    Hmmm, the raw files are dng and when I put the cursor over a thumbnail the message at the bottom says ICC: EOS 5D mark II.icm.  The image information box says, "no embedded ICC profile".  I assumed that a conversion from aRGB to sRGB would work but the result is a very washed out look.  This is not an immediate problem since it's not the colour rendition that matters right now - but I might well be wanting to transfer sRGB versions for wider use so I would like to know how.  I sent the files without a conversion but what looked good on my wide gamut monitor might not look so good on the newly weds'.

I tried to sell the photographers Qimage so that they could start to print - but failed.  I reckon a touch of Qimage and their jpegs would come out a lot better - IMHO!

Sandy
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Fred A
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« Reply #1 on: December 01, 2013, 09:34:27 PM »

Quote
The image information box says, "no embedded ICC profile".  I assumed that a conversion from aRGB to sRGB would work but the result is a very washed out look.  This is not an immediate problem since it's not the colour rendition that matters right now

The DNG files come from Photo shop but they are still raw files.  Simply put them into the queue, and Right click on the large image (preview panel upper right.)
Select Convert IMAGE from the menu....
Put a dot in TIF or JPG and also make sure there is a check in Profile to Profile Conversion.
See the circled areas in the screen snap. Make sure yours looks like mine. Also the arrow reminding you to check the Profile to Profile conversion.

That will make a full size JPG or TIF for you.

Excellent for putting on a DVD to give away.

You can also use Right mouse again, Create Email or web size copies.  Uncheck create an email, and Qimage will make smaller versions of the images with sRGB embedded in each one. You can find those in a sub folder [Q]email

Holler if you need more help.
Fred

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Terry-M
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« Reply #2 on: December 01, 2013, 10:28:00 PM »

Hi Sandy,
Quote
The image information box says, "no embedded ICC profile"
That is correct. A raw image does not have an embedded profile but QU recognises the camera and associates the correct profile to it.
Quote
I assumed that a conversion from aRGB to sRGB would work but the result is a very washed out look.
That is not correct and the reason why they looked washed out. You need to convert from the camera profile to another profile and for general use sRGB is best.
In the conversion dialogue you need to have in the "From" box <input>, see screen shot attached.
Quote
I sent the files without a conversion but what looked good on my wide gamut monitor might not look so good on the newly weds'.
They wont if they are not using a colour managed application like QU. That's why sRGB is usually the best to send to others.
You could use the web/email copies feature set to sRGB and use a custom resolution but there's no point in making it any greater than a typical screen, say 1920 pixels.
Terry
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Sandy
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« Reply #3 on: December 01, 2013, 11:43:36 PM »

As ever, thank you gentlemen.  I needed to put something in the From box otherwise Qimage protests.  So typing <input> worked.   You will say that <input> will be there already - but I forgot I had already adjusted and cropped the particular images in question which results in a jpeg of unidentified colour space.  Typing <input> in the conversion (jpeg to jpeg) did the job.  I am aware that raw files don't have an inherent colour space - but my Sony A77 raw declares aRGB which I suppose is the result of the processing Sony uses to create its raw files.

I first had to learn about Adobe RGB when I bought a Minolta 7i which had Adobe jpegs as default.  Lots of people complained about poor, washed out colours.  Minolta should have had sRGB as the default but they designed for photographers and not their marketing people (who would have had a point for once).

I haven't used Photoshop - Qimage has done me for the last 13 or 14(!) years so I'm not into dng raw.  However, I did exploit a cheap offer on Elements for some of its tools but its gui is awful.   If you have used PS and jump to Qimage it will need some learning.  But the same is true if you go the other way!

Sandy
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Fred A
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« Reply #4 on: December 02, 2013, 10:16:14 AM »

Hi Sandy

Quote
Qimage has done me for the last 13 or 14(!) years so I'm not into dng raw.

Sorry about assuming that you had used PS. You said you had a .dng file. That is a default of saving a raw in Adobe.  I knew QU didn't make that.

Quote
I am aware that raw files don't have an inherent colour space - but my Sony A77 raw declares aRGB which I suppose is the result of the processing Sony uses to create its raw files.

As you said, Raw files have no inherent color space. One has to be assigned when the image is decoded for viewing.
In the EDIT PREFERENCES RAW OPTIONS menu, you can select either colorspace for your raw images' Adobe rgb or sRGB.
You can customize your raw images.

Quote
I first had to learn about Adobe RGB when I bought a Minolta 7i which had Adobe jpegs as default.  Lots of people complained about poor, washed out colours.  Minolta should have had sRGB as the default but they designed for photographers and not their marketing people (who would have had a point for once).


Adobe RGB is generally accepted as a somewhat wider colorspace supposedly able to capture more shades of color, and therefore, more accurate.
sRGB is generally accepted as the standard for monitor viewing. It more closely matches the monitor color space.
Either one will be quite fine.

Quote
I did exploit a cheap offer on Elements for some of its tools but

TSK TSK    or as Terry has taught me, Tut Tut!!

Fred
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