ernest_ted
Senior Member
longkangman said:
:kok:
LKM :sticktong
Unable to capture purple colour with D70s
- Thread starter bayadere
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:kok:
LKM :sticktong
ernest_ted
Senior Member
bayadere said:I deleted the model kit pic already. But I took these two pictures
1
2
Picture 1 is without flash and it looks blue on the LCD screen. But on com, it looks purple.
Picture 2 is with flash and it looks purple on the LCD screen.
So is it the LCD screen fault? Is so, how to solve the problem? Thanks again.
I had the same experiences as well on my D70.
Took some purple flowers with 50mm under natural lightings.
If u play around with the colour settings in the menu, I, II ,III, the colours turned out diff on the LCD screen but ok on the PC.
:think:
Scaglietti
New Member
One of the possible problem is the fluorescent lighting (FL). FL has non-continous spectrum compared to the natural sunlight or other light sources (e.g. flashlights). FL usually have 3 main peaks in the spectrum at at around the RGB regions. This actually causes the colour differences in photos despite of how it appears to our eyes. This is because CCD or CMOS perceive colours in 3 (sometimes 4) colour channels and it is different from how our eyes work. In cases of FL, due to the non-continous light spectrum, in certain cases, there is a tendency for the captured colour to appear different. It is sometimes beyond what WB can adjust.bayadere said:I deleted the model kit pic already. But I took these two pictures
1
2
Picture 1 is without flash and it looks blue on the LCD screen. But on com, it looks purple.
Picture 2 is with flash and it looks purple on the LCD screen.
So is it the LCD screen fault
There are some full spectrum FL (those more pricey with high colour rendition ones) will have a few smaller peaks to fill the gaps between the main peaks. Although it does not fully rectify the problem with colour rendition, it does reproduce colours a little more faithfully than the normal FL. These FL are used in places where colour rendition is critical, e.g. galleries.
BC
Scaglietti
New Member
I am just talking about how the CCD capture the colours. The colours of the 2 photos in the pics above is obviously different with different light source...Artosoft said:Alamak....
It is because the camera's LCD screen is not good/accurate for colour proofing!!! Download to PC and see the colour is OK...
Regards,
Arto.
It is also known that FL causes colour rendition problems.
BC
Scaglietti
New Member
Believe me, in some cases, albiet not so common, WB cannot solve that...Artosoft said:Simple explanation: White Balance.....
Regards,
Arto.
Understand how the WB and how colour is rendered by FL... you will know why...
Try a colour chart with FL and do the WB thingy... you may find that some colours just don't appear the same with FL comparing to the photo.
BC
longkangman
Senior Member
ernest_ted said:
Tio konc liao.
I cheat lah.
Went there with friend brought in two camera one can show one cannot and she went behind the door and come up said left the camera there. Collect back the cam and problem solved.
kekeke:devil:
Scaglietti
New Member
Ok...Artosoft said:
... and I am not ruling out the possibility that it is a WB problem either... you are very likely to be right that it is due to WB adjustment... just need to note that sometimes FL gives you funny colours in some, I suppose, rare cases even when you did a proper WB.
BC
fl does give wierd colours due to non-continuous spectrum...sodium vapour street lamps do too...Scaglietti said:Ok...
... and I am not ruling out the possibility that it is a WB problem either... you are very likely to be right that it is due to WB adjustment... just need to note that sometimes FL gives you funny colours in some, I suppose, rare cases even when you did a proper WB.
BC
dawgbyte77
New Member
ernest_ted said:
I got same experience too.. purple flowers in a church. Took using 50mm with D70 and I got blue. I tried with a prosumer Fuji, same same. Grab my fren's handphone and still come out blue. In the end used photoshop to "reconstruct" it back. Not allowed to use flash and I use auto wb bec im kinda lazy to think much that day but its an interesting behavior.
dawgbyte77
New Member
Scaglietti said:Ok...
... and I am not ruling out the possibility that it is a WB problem either... you are very likely to be right that it is due to WB adjustment... just need to note that sometimes FL gives you funny colours in some, I suppose, rare cases even when you did a proper WB.
BC
My experience is sunlight through yellow stained glass so opposite the blue spectrum of flourescent.. so not sure why the red was cancelled out and I got blue.
bayadere said:Picture 1 is without flash and it looks blue on the LCD screen. But on com, it looks purple.
Picture 2 is with flash and it looks purple on the LCD screen.
So is it the LCD screen fault
There are 2 problems:
1. LCD screen is not 100% accurate. my d70 shows warmer colour than on monitor. solution: get used to it... make allowance when reviewing. set custom WB.
2. accurate colour capture is hard. even your 2 pics have different colour. different light sources (especially artificial), different WB settings (esp. auto) = different results. solution: may have to adjust on computer (with calibrated monitor). otherwise use flash for more consistency.
i remember once i photographed some artwork. had to do curves adjustments to get accurate repro
As noted by nightwolf, this is a known problem. Thom Hogan has an article on this in his latest (issue #8) of his DSLR Report newsletter (http://www.bythom.com/d1report.htm) and emphasises that purple is particularly problematic. He mentions much of the same things advised by others in this thread already (WB, etc), and points out a PS plugin that helps correct color drift, esp in purple (http://www.tribecalabs.com/technology.htm).
Purple (aka violet) is right next to UV (ultraviolet) and hence, there is the possibility that any kind of UV filtration will affect the visible violt/purple part of the spectrum due to filters not having a perfect absorbance/wavelength boundary. Sensors have UV filtration on them, plus many of us use UV filters on lenses. One experiment to try is to remove the UV filter on the front of your lens and see if that improves purple colour rendition. :think:
Purple (aka violet) is right next to UV (ultraviolet) and hence, there is the possibility that any kind of UV filtration will affect the visible violt/purple part of the spectrum due to filters not having a perfect absorbance/wavelength boundary. Sensors have UV filtration on them, plus many of us use UV filters on lenses. One experiment to try is to remove the UV filter on the front of your lens and see if that improves purple colour rendition. :think:
Purple is do able as Catchlight said if you do right in all areas. Been there done that with daughter purple square block. Now violet could be more diificult - as in ultra violet light source but a D70 can do it. Have a few shots taken in DXO that shows the UV light rim lit a subject's body frame. Down side you need to use available light and compensate on exposure and balance a flash for the subject's face. Basic 101 fill flash in a different situation from the norm.
We should not believe blindly what any one who is selling something says. I am not saying that the content in Thom Hogan is BS - have not read it - note that accurate color reproduction hasbeen a holy grail since film days - but at the end of the day he is selling his report so there has to some marketing spin. Of course customers would be less likely to buy if it went - Aiyah go buy expensive camera but do not knoweven know how to use your camera hor so sad, come let me teach you the basics of how to do this - pay me money first. Same message different text - one flatters you, the other tells it as it as.
I am some what reluctant to post this since there is a trend that if it cannot be done its the camera's fault - as a photographer if it cannot be done more likely than naught its your fault because you did not know enough to do it right to get the picture. Most people do not like to be remindered that they do not know enough - was there too myself at one time but have since moved on. Now I am happy when I find I do not know enough it mean I have to learn more to become better. Perhaps this can help some of you. Call
We should not believe blindly what any one who is selling something says. I am not saying that the content in Thom Hogan is BS - have not read it - note that accurate color reproduction hasbeen a holy grail since film days - but at the end of the day he is selling his report so there has to some marketing spin. Of course customers would be less likely to buy if it went - Aiyah go buy expensive camera but do not knoweven know how to use your camera hor so sad, come let me teach you the basics of how to do this - pay me money first. Same message different text - one flatters you, the other tells it as it as.
I am some what reluctant to post this since there is a trend that if it cannot be done its the camera's fault - as a photographer if it cannot be done more likely than naught its your fault because you did not know enough to do it right to get the picture. Most people do not like to be remindered that they do not know enough - was there too myself at one time but have since moved on. Now I am happy when I find I do not know enough it mean I have to learn more to become better. Perhaps this can help some of you. Call
All valid points. I would add that one shouldn't believe anything anyone says, regardless of source, but form your own informed opinions. Seriously.ellery said:
But you might have missed my point: I was merely pointing out that Thom had written just about all the things others have already advised on this page, and also makes the same points you have about it being "doable", as long as you (the photographer) ensure things like WB, exposure, etc are all properly taken care of. So we are all actually in agreement.
I also agree with you that it is very shallow to blame the equipment. It is always possible to achieve something "impossible" with the resources at hand, provided you want to do it bad enough, AND you understand the capabilities and limitations of what you have. In this case, learning and understanding the hardware characteristics and physical limitations of your camera and lenses certainly helps in achieving the desired image, because - as a photographer - you can actively decide what needs to be done (Incidentally, a point that Thom makes often in his writings). Quite different from saying "it's the camera's fault".
Struggling to understand your point, and apologies in advance if I am mistaken in thinking that it sounds somewhat cynical? We pay for lots of things, and in trying to learn about something, paying for a concise summative opinion from an "expert" is what we do everyday. We buy, and are sold, books, newspapers, tuition, etc. - for informational and instructional purposes.ellery said:
On the other hand, you seem to distrust a source simply because it has to be paid for, and hence might have a 'marketing spin'? To follow that train of thought to its logical conclusion, the info contributed to ClubSnap forums has to be better because it is free? :devil:
All that aside, I sincerely do appreciate your intentions in "pay[ing] it forward". Just trying to understand your viewpoint.
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