.jpg import color accuracy

I need to preserve exact color accuracy when I import a simple line graphic. If I import a perfect .jpg or perfect .gif file image, with lines of perfect cyan in the image, when the image is displayed, the lines have been "smoothed out" at the edges by adding some portion of black to the pixels. In the Media file that iMovie creates to store stills, clips and audio, the original graphic image file can be found (graphic.jpg) along with an additional, corrupted file (graphic-1.jpg) which is the image that iMovie apparently uses and has been modified as I described. How can I prevent this?
Thanks very much!

Hi Tony,
welcome to this forum
I need to preserve exact color accuracy when I import a simple line graphic. If I import a perfect .jpg or perfect .gif file image, with lines of perfect cyan in the image, when the image is displayed, the lines have been "smoothed out" at the edges by adding some portion of black to the pixels.
we stumble into a bunch of unsolvable problems:
a) color precision - an issues since the beginning of picture processing with computers... what ar we talking about, RGB or CMYK? in case of RGB, we have it a ittle easy, because that's how Monitor work... you need to calibrate your monitor AND you need to set up the color profiles in your grapgic apps...
b) .jpg - is not a color precise compressor, you should choose any lossless codecs as tiff (huge files, but... quality has its price)....
c) changing compressor codecs - you have to switch the codecs, because "dv" has a totally different color scheme then anything else... (and iM works with dv....); dv is a mainly a video-format, pointed to work with tapes and and TVsets...; the dv codec just store every 8th pixel some color-info.... color precision on TV...?? lol
d) video standards - why do we Europeans make cheap jokes about NTSC (=never the same color)....? because it's true...
e) resolution - you create your graphics on a hiRes computer screen without interlacing... dv uses about a quarter of res, adds interlacing, less colors....
f) iMovie/any video! can just "estimate" the colors of your grafix....
solution: judge the final pic quality on a TV; choose "TV safe colors" (e.g. red=NoGo, neutral grey=NoGo, any "plain,pure color" (as cyan) =NoGo... now you know, why 90% of sets in TV sitcoms have greenish walls... green=good with NTSC...); choose non-serif typo; use BIG grafix....

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<dir>
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Last edited by Wu (2015-01-24 21:12:23)

firewalker wrote:
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confirmed.
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John "McPhotoman"
 color="#800000" size="2">~~ John McWilliams
 
 
 
 MacBookPro 2 Ghz Intel Core Duo, G-5 Dual 1.8;
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"In this article I report the accuracy reached with the above scripts in my calibration effort, some validations in different lightning condition and the impact on new color balance caused by the adjust sliders and the tonal curve movement."
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Link to Article
Ciao
Marco

Chris,
>>>
The ICC uses LAB D50, as does Photoshop.
Marco,
>>>
(prof. Boscarol) on his forum:
>>>
1.Lab is not absolute and there are infinite Lab.
>>>
2.The illuminant E is a theoretic reference illuminant
I must disagree with the implied conclusions in both statements, but with a friendly, not confrontational tone. And, Adobe and other software may be assuming Lab is D50. I cannot and would not dispute that.
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I just downloaded the trial version of Lightroom. I have a Nikon D50 and I am using it in the highest JPG quality (or RAW when I shoot for special occasions) in P mode. I do now have about 1500 photos on my hard drive and because I just installed Lightroom, I want to import these to create my library.
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Dany-
 
 I won't be able to answer in detail on color management issues in general, but there's some good reading suggested in other threads.
 
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John "McPhotoman"
 color="#800000" size="2">~~ John McWilliams
 
 
 
 MacBookPro 2 Ghz Intel Core Duo, G-5 Dual 1.8;
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Give Kudos to say "thanks" by clicking on the "thumps Up icon" .
Click "Accept as Solution" if it solved your problem, so others can find it.
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.jpg import color accuracy

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