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DPChallenge Forums >> Web Site Suggestions >> Images to cal monitors with for voting
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 09/19/2002 03:37:53 PM · #1
Perhaps this has been brought up before but I can't locate it in the gazillion posts available so here goes. For the past couple weeks I've been standing around the edges of the site reading posts, critiques, rants and the like. I've noticed variations on sharp vs. fuzzy, color, tone, saturation, etc coming up over and over. To level the playing field could the site have a set of images and instructions to "calibrate" the monitors so that everyone "sees" close to the same thing? Something like a grey card so we can adjust the monitor to the proper level and perhaps something like a resolution chart so those complaining of "fuzzy" images can determine whether it is the photo or their monitor. I'm not sure how the color issues could be handled but someone may have an idea to deal with this one. If potentially thousands of people are going to be able to critique my photos I'd like what they see to be close to what I see for a fair evaluation.
 09/19/2002 04:22:12 PM · #2
Makes perfect sense. Puts everyone on the same playing field
 09/19/2002 04:32:04 PM · #3
Great suggestion.

A lot of people have asked for this, but what we're missing is a good set of images that we can use for this, that we can use legally (i.e., without violating any copyright).

Any assistance on locating these would be greatly appreciated.

Thanks,
Terry
 09/19/2002 04:59:46 PM · #4
Originally posted by ClubJuggle:
Great suggestion.

A lot of people have asked for this, but what we're missing is a good set of images that we can use for this, that we can use legally (i.e., without violating any copyright).

Any assistance on locating these would be greatly appreciated.

Thanks,
Terry


At one point I wrote a python script that produces greyscale and
also red/ green/ blue test strips for brightness.

I even posted the script but never quite got around to doing the
screen captures. I'll try and get it done this weekend.

 09/19/2002 05:23:57 PM · #5
jonr previously posted suitable color and grayscale targets in this thread.

I suggest putting them at the top of the voting thumbnails page; they don't need to be on every image page.

* This message has been edited by the author on 9/19/2002 5:22:52 PM.
 09/19/2002 05:26:53 PM · #6
I was just reading one of the other forums and a poster was apologizing for downgrading some of his votes due to a problem with his monitor that he just corrected. He asked people to contact him and he would evaluate their shots again. Wonder how many others may have this problem.

Gordon, how about resolution images to deal with the "Your shot was too fuzzy" - "Was Not!" issue? Got any ideas?
 09/19/2002 05:30:42 PM · #7
Originally posted by GeneralE:
jonr previously posted suitable color and grayscale targets in this thread.

I suggest putting them at the top of the voting thumbnails page; they don't need to be on every image page

That was the point I think, jonr just pinched the graphics from
dpreview.com

We can't actually do that legally.
 09/19/2002 05:35:49 PM · #8
Well, it's no problem to make a grayscale target -- I can do that if necessary...I'm not sure how to make that particular color target though. We could provide a link to the dpreview page; or why not ask them for permission to use their images with a plug/link for them en lieu of royalties?

* This message has been edited by the author on 9/19/2002 5:34:41 PM.
 09/19/2002 06:05:12 PM · #9
Originally posted by GeneralE:
Well, it's no problem to make a grayscale target -- I can do that if necessary...I'm not sure how to make that particular color target though. We could provide a link to the dpreview page; or why not ask them for permission to use their images with a plug/link for them [i]en lieu of royalties[/i]

well, like I already said, I've done it so we don't really need to.
 09/19/2002 06:47:28 PM · #10
Oh MY God!!!!! I just used the directions in the jonr thread and no wonder my pictures are tanking eeeeeeeeeeeeeeek. All the shadow area were originally black. aarrrrggggg.
 09/20/2002 03:22:40 PM · #11
Originally posted by aelith:
Oh MY God!!!!! I just used the directions in the jonr thread and no wonder my pictures are tanking eeeeeeeeeeeeeeek. All the shadow area were originally black. aarrrrggggg.

One down, a few thousand to go :)

Well at least it changes how you look at the world :0
 09/21/2002 09:28:08 AM · #12
Originally posted by GordonMcGregor:
Originally posted by aelith:
[i]Oh MY God!!!!! I just used the directions in the jonr thread and no wonder my pictures are tanking eeeeeeeeeeeeeeek. All the shadow area were originally black. aarrrrggggg.

One down, a few thousand to go :)

Well at least it changes how you look at the world :0[/i]



Will this do :
09/21/2002 09:38:45 AM · #13
Gordan you are right. I am thinking brighter. and Woo HOO the sun has shifted: the lights shadows are different. :D Thanks for the scale.

aelith
 10/01/2002 08:37:56 PM · #14
I know,I know, it has been talked about.
How about adding a simple gray scale on each voting page, incase you monitor is off.
This one is free I just created it. It is simple and it would help.
The problems are just the shadows and highlights.
10/01/2002 08:47:37 PM · #15
I see the scales now what do i do with them?

Tim
 10/01/2002 08:57:35 PM · #16
Originally posted by Niten:
I see the scales now what do i do with them?

Tim

If you can see the difference between all the steps your doing good.
most people can see some but not all.
the most important are the 0, 2, 5 and 255, 253, 250.
While this is not the gamma correction at lease you will see all the details.
It is a start.
 10/01/2002 09:01:39 PM · #17
If you want to change gamma or want to know about it go to //www.photoscientia.co.uk/Gamma.htm
I think this is the best site on it.
 10/01/2002 11:39:16 PM · #18
Originally posted by Milton:
I know,I know, it has been talked about.
How about adding a simple gray scale on each voting page, incase you monitor is off.
This one is free I just created it. It is simple and it would help.
The problems are just the shadows and highlights.
10/02/2002 07:40:00 AM · #19
This target was made in rgb and was set up using Photoshop. The values are slight only because if you can see all the steps then you would be able to see the steps in the middle. The number in the middle are the values for the for there respective targets. The gray strip is set to 127 around the middle.
photoscientica.co.uk)
Take a look at this gamma target from around 6-10 feet away from you monitor. The items on one of them will start to blend together that is your gamma.
From what I have read the ideal gamma should be 1.8 what Mac are set up at. But as a practical man I have set up my gamma at 2.2 like most pc users. You guys out number Mac in the web (world). For this site the gamma is not that big a deal. What is more important is we all have similar setting.
So I propose a setting of 2.2 should be establish.


* This message has been edited by the author on 10/2/2002 7:40:23 AM.

* This message has been edited by the author on 10/2/2002 7:40:48 AM.
 10/02/2002 09:25:24 AM · #20
I'm a little confused by your post, my understanding was
that the correct gamma to use with a Mac, because of the video
cards used, is 1.8 and the correct gamma typically used on a
PC is 2.2

I'm not sure what sort of weird effects you'll see using a
non-standard gamma on a Mac.

Gamma is just the adjustment curve used to compensate for the
look-up tables in the video card, and how they map to the actual
colours on the screen.

But I could be wrong about this, but I thought an image that
looks right on a 2.2 gamma PC would look the same on a 1.8 gamma
Mac screen.

 10/02/2002 10:55:12 AM · #21
Originally posted by GordonMcGregor:
I'm a little confused by your post, my understanding was
that the correct gamma to use with a Mac, because of the video
cards used, is 1.8 and the correct gamma typically used on a
PC is 2.2

I'm not sure what sort of weird effects you'll see using a
non-standard gamma on a Mac.

Gamma is just the adjustment curve used to compensate for the
look-up tables in the video card, and how they map to the actual
colours on the screen.

But I could be wrong about this, but I thought an image that
looks right on a 2.2 gamma PC would look the same on a 1.8 gamma
Mac screen.



No that is not 100% true.
Every monitor has a gamma set when it is sold. As you said 1.8 for Mac and 2.2 for pcﾃ｢冱 in general.
I am going through this problem in the current voting. As my monitor was set for my printer.
This will demonstrate what happens with different gammas
10/02/2002 11:17:37 AM · #22
Originally posted by Milton:
If you want to change gamma or want to know about it go to //www.photoscientia.co.uk/Gamma.htm
I think this is the best site on it.

This applet that he provides a link to was probably the most useful to me in setting my gamma. Might be worth a look as well.

-Terry
 10/02/2002 11:40:38 AM · #23
All of the black squares look all the same color. Actually it looks like one black line. I tried to set my brightness and it still doesn't work. What am I doing wrong?

Originally posted by Milton:
I know,I know, it has been talked about.
How about adding a simple gray scale on each voting page, incase you monitor is off.
This one is free I just created it. It is simple and it would help.
The problems are just the shadows and highlights.
10/02/2002 11:56:58 AM · #24
When I set my gamma to match the black squares these pictures looked really washed out. Way to bright, so I canceled it. The pictures look fine to me without messing with my monitor settings. what should I do now? I'm thinking about leaving it alone. I have never had a problem with lighting or people saying my photo is to bright except for last weeks challenge.

Originally posted by Milton:
Originally posted by GordonMcGregor:
[i]I'm a little confused by your post, my understanding was
that the correct gamma to use with a Mac, because of the video
cards used, is 1.8 and the correct gamma typically used on a
PC is 2.2

I'm not sure what sort of weird effects you'll see using a
non-standard gamma on a Mac.

Gamma is just the adjustment curve used to compensate for the
look-up tables in the video card, and how they map to the actual
colours on the screen.

But I could be wrong about this, but I thought an image that
looks right on a 2.2 gamma PC would look the same on a 1.8 gamma
Mac screen.



No that is not 100% true.
Every monitor has a gamma set when it is sold. As you said 1.8 for Mac and 2.2 for pcﾃ｢冱 in general.
I am going through this problem in the current voting. As my monitor was set for my printer.
This will demonstrate what happens with different gammas
10/02/2002 12:01:01 PM · #25
Originally posted by Milton:
If you want to change gamma or want to know about it go to //www.photoscientia.co.uk/Gamma.htm
I think this is the best site on it.
Try this site

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