Chuck wrote:
> Why are you trying to convert YCbCr to sRGB? Is not your original image
> in sRGB? AFAIK, YCbCr was used for component video input to CRTs. How
> did it get that way and why? Is that what they're using for printing...
> exposure of regular photo paper by CRT??? Check your original image. It
> should be sRGB and resubmit for a *free* reprinting.
>
> Chuck Norcutt
>
> On 7/30/2013 11:17 PM, Brian Swale wrote:
>
> Within a day I had returned to me the prints I ordered from 500 k
> away. The photo 'On the road to
> Ranfurly" http://zone-10.com/tope2/main.php?g2_itemId=7495 Has come out
> with the orange all wrong, and i checked and discovered that it has a cymk
> (or something like that) color space.(actually YCbCr - they all are). The
> laboratory guy said it should be sRGB, and definitely not aRGB. I tried
> most of the image management programs I have on this machine; LR,
> Lightzone, an old version of PS, Olympus Viewer 2, Irfanview, FastStone
> Image Viewer, Corel Aftershot; and none of them could I persuade to
> convert it to sRGB. Lightzone came the most close as it reported that it
> had. But it lied to me.. Any suggestions? PS ( Post Script, not Photo
> Shop), that photo was taken with an E-1 and the venerable 14-45 DZ lens.
> It is easily sharp enough for the 30 x 41 cm print I have. Brian Swale
I personally, have a CRT screen on my computer. I don't know if that has
affected how image programs report back to me.
I did find some images for which Picture Information Extractor was able to
tell me the colour space is sRGB, but for most it reported (on that
information line) that the image is uncalibrated, and that YCbCr is another
descriptor it applied to them.
Images downstream of Lightroom processing had no image colour
information of any kind that PIE could report on, it seems.
Today I went to a local lab that usually I don't use because they are more
costly. I lightened up the image just a smidgen ( or so I thought) but it came
out far too light in hue. Another $25 down the tubes ...
The operator/owner said that since my monitor would not be calibrated as
his lab monitor is, to show the same colour that is produced by printing
there, there's no way I could get a match. He said that if I call in on Monday
he/I can edit it on his machine. I'll do that.
I've never had this problem before. Anywhere. Usually the max size I get
printed is 8 x 10 / 8 x 12 inches. In the past the prints have invariably come
back exactly as I anticipated.
This one is 30 x 41 cm.
I'm running out of time to get them matted and framed before I submit them
for entry.
I have to say I don't understand the relationship between YCbCr and
sRGB/aRGB, if there is one. Wikipedia was no help.
Thanks for your interest.
Brian Swale.
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