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Ensure all linked or embedded raster images are in CMYK format at 300ppi (as well as other Photoshop requirements) Ensure all blacks are accurate. Whether using rich black or greyscale black, ensure objects are correct. And for heaven's sake change the preferences to always display and always output blacks accurately.
As obviously the CMYK profile I used was not the same as the printers and also I was using some cheap ink ;-) Final Trial and Error: So I tried to get the perfect RBG combination so that it prints from Magenta cartridge only, with target around CMYK(0,255,0,0). I tried this exercise using all the below CMYK profiles for my test print ...
With a PDF open, choose View > Tools > Print Production > Preflight from the menu. You can use any of the options in the green box below to simply verify compliance with PDFX standards, which requires no RGB data to be compliant. Once you run the compliance test, you can see easily if there is any RGB data and on what page of the PDF it is located.
1/ converting the image in Image Mode > Grayscale and then dragging & dropping in the CMYK template. 2/ converting the image by Edit > Convert to profile > CMYK and dragging & dropping in the CMYK template. In both cases the image CMKY template does not look perfectly grey. There's always a hint of red or blue/green.
3. Measuring Print Quality. Sheet fed Offset and Gravure are high-quality printing presses that are used to achieve the highest precision registered images. The quality of a printed image cannot be easily judged. The precise technology that is used for colour is not reproducible.
Is it actually showing the true CMYK color? I'm very much convinced that I need to profile my monitor if I'm choosing colors based upon what my monitor shows as CMYK. Even that wouldn't be ideal. The best way would be is to have the print of color chart from the printer I'm about to print. I cannot buy those pantom color books.
CMYK is the colors of the ink in a commercial press. RGB is used for on screen digital images. If you mix RGB light together, you get White, which makes you colors on screen look extra bright. CMYK is limited to what the 4 hues can achieve when combined. The best way to use CMYK is to limit the amount of hues used to achieve a color.
For CMYK, test across a variety of print processes and substrates – litho coated, litho uncoated, digital and newsprint would be my recommendation as a minimum. As with RGB, if there are any print processes and substrates relevant to ‘key’ touch-points for the brand, then you should also consider testing these.
The printing company needs the image in CMYK and as for format, I wanted to use .tif . I have never used that one before or prepared banner for print. Anyway, I sent the prepared-for-print image to my boss and when he opened it, the colors were reversed. He used a program called IrfanView. I checked everything on my side, as well as downloaded ...
Thereafter when you are exporting for print, use PDF and the preset PDF/X-1a. (its always good to convert fonts to curves) Remember that CMYK is "duller" than RGB, but when you start to use CMYK, the colour will become normal to you. Also make sure you are using the CMYK colour palette, which should be under Window>Color Palette>CMYK Palette.