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jpeg to tiff
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Why has my monochrome Jpeg image changed in colour when i saved it to Tiff at 300dpi. i am submitting a photo or two to the IPF year book and the requirements are tiff at 300dpi in CMYK format. I am using photoshop 7.
Chances are it’s the coversion to cmyk that’s changed the colours, not the saving as a tiff,
Dave
so is it possible to change from RGB mode to cmyk without affecting the colour? Originally my image was in colour and in RGB mode. Then i changed it to monochrome. Now i have to change it to CMYK and as a tiff as are the requirements for possible submission to IPF year book, but the monochrome effect changes slightly and takes on a grayish look when i change it to CMYK. Is there any other way around this or what am i doing wrong. Cant go back and take this shot again.
Steve Crozier (stsc) from this here parish will give a better explanation than I can but what you see on screen in your rgb mode is not what prints on a sheet of paper. The printer has to convert to cmyk to get the image on paper. What you’re seeing is a simulated cmyk as your screen is rgb and the computer is taking a best guess as to what it will eventually look like.
Try to print the converted cmyk file to check that it actually is ok before you send it off. If not then you will need to make sure that the right cmyk profile is used in the “Color Settings”. I generally use Euroscale, but again others might have a different view on that,
Dave
Another query, when i change my 180dpi jpegs to tiff 300dpi as required for possible entry into the IPF year book they become 84.6 MB is that normal and how will i fit 8 of them on a 700MB disc, and they take forever to upload to a disc. any help lads would be great i have to get them in the post…tomorrow the latest.
By my reckoning 84.6 x 8 = 676.8Mb. So should fit on your 700Mb CD. And it is normal for 300dpi tiff files to be quite large.
The colour shift comes from the conversion from RGB to CMYK. Apart from that it’s not a good idea to convert from JPEG to TIF. TIF is the higher quality file and contains more information than a JPEG file. Usually it’s done the other way around to create smaller files.
Colour conversion is a bit tricky. First and foremost you need a calibrated monitor. Then you need a profile from the printer or magazine people. The problem is that the CMYK colourspace(s) is/are much smaller (=less colours) than the RGB colour space(s). This means that many RGB colours have to be converted to the nearest in the CMYK colour space. And that’s where the colour problems can happen, even in black and white.
Having said that you don’t need to use CMYK with monochrome images. Converting to Grayscale (which you’ve already done) should do it. No colours, no colour conversion. You just need to check if there is a profile for the publication available and adjust your colour settings (dot gain) in Photoshop.
All the best,
Carsten
Carsten Krieger Photography – http://www.carstenkrieger.co.uk
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