dpjava explained - DPChallenge Forums

Canon EF 24-105mm f/4.0L IS

10/07/2002 03:19:31 PM · #1

This photo best explains why there should be a gamma target on the web site.
Many people looked and liked it but most important, they saw the logo as the reflection in the coffee.
A lot more did not see the logo. There comment were nice shot but where is the reflection.
I originally had my monitor to a gamma of 1.0
I now have reset my monitor to a gamma of 2.0
I have included the following images in hopes that a gamma target is included with this site.
there is a gamma target on the right. You need to find where lines and the center gray all blend together.

It can make a difference.
If your gamma is set to 3.0 there is no way to see 1.0 (my problem)
If your gamma is set to 2.0 you can see the 1.8 and 2.5.

lionelm

Canon EOS-10D

10/07/2002 03:53:18 PM · #2

Hello, I have no idea if this apply to me (I have a laptop) but if I set the angle of the screen right I see the reflection (and I saw it when I voted) but if the incline is not right I do ont see the reflection.

Q : Do you 'calibrate' a LCD as well ?

drewmedia

Canon EOS-300D Rebel

Canon EF 28-135mm F/3.5-5.6 IS USM

10/07/2002 04:16:20 PM · #3

I recalibrated with Adobe Gamma today after seeing (or rather not seeing) your image ... and I still don't see it.

Drew

Jak

Fujifilm FinePix S602Z

10/07/2002 04:17:54 PM · #4

I was recalibrated last week on my work monitor and I still only barely see the image.

Canon EF 24-105mm f/4.0L IS

10/07/2002 04:40:57 PM · #5

You need to adjust you black point (brightness).
Where I see shades of gray you see black.

//www.photoscientia.co.uk/Gamma.htm
You need to adjust your black point first then the gamma.

* This message has been edited by the author on 10/7/2002 8:39:44 PM.

CreativeFlyPhoto

Canon EOS-5D Mark III

10/07/2002 05:13:02 PM · #6

i didnt see any reflection either untill i jacked the brightness and contrast way up ... cool concept though

psychephylax

Canon EOS-5D Mark III

Canon EF 28-135mm F/3.5-5.6 IS USM

10/07/2002 09:18:57 PM · #7

I would go by majority vote. If most people failed to see it I would guess it's you who shall adjust the monitor :)

Sorry but trying to get all of DPC to adjust the monitors to yours is an impossible task.

* This message has been edited by the author on 10/8/2002 1:17:05 AM.

lisae

Olympus C-720UZ

10/07/2002 09:36:08 PM · #8

After seeing this thread, and having struggled with calibration before, I decided to try something new and just turned the brightness and contrast up to full on my monitor, and used the gamma, brightness and contrast controls on my video card's drivers to adjust my display settings until I seemed to have a gamma around 2.0 (1.8 seemed too bleh) and could see most of the squares on the grey scale thing posted later in the thread.

Now I see the dpjava photo in all its glory! But... half of my photos look crap :(. I have a habit of adjusting the midpoint in the levels for my photos to lighten them a bit, but now a lot of them look too light. How frustrating.

10/07/2002 09:41:21 PM · #9

Originally posted by psychephylax:
I would go by majority vote. If most people failed to see it I would guess it's you who shall adjust the monitor :)

Sorry but trying to get all of DPC to adjust the monitors to yours is an impossible task

That is what I did. It is now 2.0
What I am trying to do is let people know they have option for better viewing.
All those who still can not see it have a problem in that, what they see is not what people have posted.
Instead of 16 million colors they see 8 million or 1 million. In a B&W photo they see 200 level of gray and not 250. It makes the photos flat. The photos they submit do not have the same chance.
A lot of the photos I liked in the dpchallenge changed to I really really liked.
And I would have given a better score.
Learn from my mistake.

10/10/2002 04:28:46 PM · #10

just in case you needed a nother place for gamma targets and how to "gamma making fine print"

* This message has been edited by the author on 10/10/2002 8:27:14 PM.

jkiolbasa

Sony DSC-F707

10/10/2002 07:00:07 PM · #11

I think either way, your photo is not using the full dynamic range available. You have alot of very high values in the saucer and background, and very dark tones in the coffee. If you ask me, this makes it perfect to use the curves tool to boost the low value range into the unused middle range, then alot more people would see the reflection.

Also, setting two monitors to the same gamma using the mid-point gray as the calibration point doesn't mean every video setup calibrated to the same gamma value will display images identically. In other words, the curve isn't the same ideal shape across all video setups.

Moral of the story: learn to love the curves tool, and learn to read histograms.

Anachronite

Sony DSC-S85

10/10/2002 07:01:04 PM · #12

well the gamma adjustment is easy, right click properties and look for the settings tab.. then color managment tab somewhere after that depending on your video card... the only problem is my gama stays on 1.0, anything over than that I don't like the look of the sceen... and while it does make your reflection very visable, adjusting the gamma to see the reflection seems to make the reflection look fake... at least on my system... (gforce-3 graphics card and 17" quality monitor)