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Honored Contributor
Posts: 7,881
Registered: ‎08-13-2015

Re: Prefix file name underscore versus 8


@Zbadger wrote:

My HDR images are Adobe RGB images, but I just checked my first C1 setting and sure enough, a photo I took had an sRGB image taken.  However, I have not been using C1 when these occasional images with an 8 prefix have showed up.


I am pretty sure that the 5D4 saves HDR images as JPEGs.  

 

A48C7B44-57CB-43CE-86CA-9B2806CB895D.jpeg

 

I have never heard of an “Adobe RGB image” JPEG file before.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
Esteemed Contributor
Posts: 4,897
Registered: ‎06-25-2014

Re: Prefix file name underscore versus 8


@Waddizzle wrote:

@Zbadger wrote:

My HDR images are Adobe RGB images, but I just checked my first C1 setting and sure enough, a photo I took had an sRGB image taken.  However, I have not been using C1 when these occasional images with an 8 prefix have showed up.


I am pretty sure that the 5D4 saves HDR images as JPEGs.  

 

A48C7B44-57CB-43CE-86CA-9B2806CB895D.jpeg

 

I have never heard of an “Adobe RGB image” JPEG file before.


Any JPEG has a color gamut associated with it; and on (I believe) any reasonably high-end Canon camera, that can be either sRGB or Adobe RGB. And any decent photo editor can produce either one in a RAW-to-JPEG conversion. Some (most?) commercial-grade printers must be able to read the gamut setting from the Exif data, because if I ask my favorite print shop which they prefer, they always tell me it doesn't matter.

 

Or am I misunderstanding the point you're trying to make?

Bob
Philadelphia, Pennsylvania USA
Honored Contributor
Posts: 7,881
Registered: ‎08-13-2015

Re: Prefix file name underscore versus 8


@RobertTheFat wrote:

@Waddizzle wrote:

@Zbadger wrote:

My HDR images are Adobe RGB images, but I just checked my first C1 setting and sure enough, a photo I took had an sRGB image taken.  However, I have not been using C1 when these occasional images with an 8 prefix have showed up.


I am pretty sure that the 5D4 saves HDR images as JPEGs.  

 

[ deleted ]

 

I have never heard of an “Adobe RGB image” JPEG file before.


Any JPEG has a color gamut associated with it; and on (I believe) any reasonably high-end Canon camera, that can be either sRGB or Adobe RGB. And any decent photo editor can produce either one in a RAW-to-JPEG conversion. Some (most?) commercial-grade printers must be able to read the gamut setting from the Exif data, because if I ask my favorite print shop which they prefer, they always tell me it doesn't matter.

 

Or am I misunderstanding the point you're trying to make?


Maybe I misunderstood what was being said.  I thought he was saying the HDR images are saved as RAW files.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
Occasional Contributor
Posts: 13
Registered: ‎05-28-2019

Re: Prefix file name underscore versus 8

I think you need to go through the entire thread.  There is a switch in the name convention in some of my pictures from _ to 8 as the prefix.  The .jpg ones with the _ (which are the vast majority) ahow "Uncalibrated" when looking at Properties and then at "Color Representation".  However , the ones that are labelled "8" show "sRGB".  Thus, I am getting photos upon download not in chronological order - a bunch of intermittent "8's" at the end of each folder.

 

Canon suggest there might be something wrong with the camera???

 

But another contributor TT Martin wrote:

 

"If one of your Custom settings (C1, C2, C3) has sRGB colorspace saved in it this would explain it."

 

I responded " ...... I just checked my first C1 setting and sure enough, a photo I took had an sRGB image taken.  However, I have not been using C1 when these occasional images with an 8 prefix have showed up."

 

 

Occasional Contributor
Posts: 13
Registered: ‎05-28-2019

Re: Prefix file name underscore versus 8

I did post a reply but hope it did not come off as unappreciative or snarky. The thread has gone in so many directions. Thanks for your comments. PS - what I read is the prefix _ is indicative of Adobe RGB and the prefix 8 is indicative of SRGB.
VIP
Posts: 10,933
Registered: ‎12-07-2012

Re: Prefix file name underscore versus 8

"...what I read is the prefix _ is indicative of Adobe RGB and the prefix 8 is indicative of SRGB."

 

Bingo! Smiley Happy

EOS 1DX and 1D Mk IV, even less and less other stuff.
Occasional Contributor
Posts: 13
Registered: ‎05-28-2019

Re: Prefix file name underscore versus 8

Yes - so does anyone know how my camera could be spitting out 2 different prefixs and therefore 2 different color presentations?  When I go to the actual files on my screen on the camera, most show Adobe RGB, but for example, one of them with the 8 prefix shows the color represntation to be sRGB.  So these 2 differences have been recorded on the compact flash card.  This is thus before download to my desktop.

Respected Contributor
Posts: 1,967
Registered: ‎02-26-2015

Re: Prefix file name underscore versus 8


@Zbadger wrote:

Yes - so does anyone know how my camera could be spitting out 2 different prefixs and therefore 2 different color presentations?  When I go to the actual files on my screen on the camera, most show Adobe RGB, but for example, one of them with the 8 prefix shows the color represntation to be sRGB.  So these 2 differences have been recorded on the compact flash card.  This is thus before download to my desktop.


Yes, as mentioned it could be saved in one of your Custom settings (C1, C2, etc.), it would use sRGB if you ever use the Automatic Green Square Mode, and possibly other built in automatic functions like automatic HDR. Until you can correlate what your camera settings were when you didn't get Adobe RGB it is hard to tell. There is a 99.99999% chance there is nothing wrong with your camera. 

 

Why are you using Adobe RGB? You know unless you can ensure Adobe RGB is being used throughout the process (i.e. computer, monitor, printer, etc.) it is likely to introduce color errors. And in the end Adobe RGB will be lost when viewed by anyone else without specialized equipment.

Some excerts from the fStoppers article AdobeRGB vs. sRGB, by Zach Sutton, February 17, 2013

 

'sRGB came first, and almost everything on a computer is built around sRGB. The internet, video games, applications, personal devices, and most everything else has adapted sRGB as their standard for color space. Even the monitor you’re using likely cannot display all the colors of AdobeRGB. That's right, most traditional computer monitors can only display about 97% of the sRGB color space, and only about 76% of the AdobeRGB color space. Even screen calibrators will often tell you how much of the color gamut you're able to display.'

 

'Since most web browsers have adapted sRGB as its color space, if you upload an image to the internet with the AdobeRGB gamut, the browser will convert it to sRGB, and it’ll do a terrible job at it, '

'Printers, have began adapting the AdobeRGB color space. This allows for more vibrant colors in your prints, with better color consistency that your own monitor cannot even replicate. But do you want your prints to look differently than they do on your monitor? I say yes, as it provides richer colors that bring out details that would otherwise go unseen.'

 

Note this is NOT an article against using Adobe RGB, in fact in his conclusion he states he uses Adobe RGB, but, specifically because he mostly shoots for making prints.

Occasional Contributor
Posts: 13
Registered: ‎05-28-2019

Re: Prefix file name underscore versus 8

I ws using either P, M or HDR with +-1 stop.  Not the custom functions.   So there is the quandry.  How can that be explained?

 

Yes - most of my photos are seen electronically but I want Adobe RGB for those that I print for the wall.

VIP
Posts: 10,933
Registered: ‎12-07-2012

Re: Prefix file name underscore versus 8

"There is a 99.99999% chance there is nothing wrong with your camera."

 

Also he is correct about AdobeRGB.  If you aren't printing on a real photo printer, not just one that prints color, it helps nothing.

I am not sure it ever hurts anything but you are not getting any benefit from using it over sRGB.

EOS 1DX and 1D Mk IV, even less and less other stuff.
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