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This is a standing problem. When you open an image, it may be the RGB format, it may be CMYK format. If it is CMYK images into RGB images of the reason for the very full. Because, in the lattice image editing software, once for each image color space conversion, will lose some of the original image details. If you convert an image while RGB, while conversion to CMYK, the image of the details of the loss will be great. Therefore, professional designers will not easily back and forth the image color space conversion. The question now is: If you enter the process of image format allows you to select RGB or CMYK format, you will choose to do what? When you first select the RGB format, for images of the adjustment, when the image is converted to CMYK format most appropriate?

RGB is all the equipment based on optical principles used in color mode. Such as monitors, RGB mode based on the work. The RGB color range is greater than CMYK, so, RGB to the performance of many colors, especially bright, bright colors, simply print it out. This is when the color mode from RGB to CMYK conversion because when the screen is dimmed. RGB image editing in Photoshop, you can choose View menu CMYK Preview command, that is, using RGB mode editing, and in CMYK mode display. Is that a good approach, because the edit the image with the RGB efficiency is higher than with the CMYK mode, Photoshop work in CMYK mode, because of the RGB color channel, one more than the other, it use the RGB appear to simulate the CMYK monitor results, and, CMYK of the calculations and based on completely different principles of optics RGB, so, edit the image with the CMYK efficiency more naturally to the bottom.

Another way of editing images with RGB, some of the filter does not support the CMYK mode, you can image in Photoshop will convert CMYK mode, and then look at the filter menu. Also, many image editors often through subtle processes such as the pieces may have to image the contents of the portfolio together, and because of the various components of the original colors can not the same, they need to be adjusted, it may be in some way so that all parts of the synthesis and processing for filters, etc.. Whether the process is, you definitely will want to produce as much as possible and retain a variety of subtle effects, as much as possible the details of the screen with rich, who like it flat and lifeless pictures? Just said, RGB color range to be much larger than the CMYK. So, when in RGB mode when editing images in the editing process, you will get a broader color space and a more subtle effect of changing the editor, and these effects, if used well, most can be maintained. Although ultimately have to convert CMYK colors and the loss will certainly be no doubt, but why at the outset it “lost” mean?

Incidentally, both the RGB image into CMYK, CMYK, or use the CMYK Preview simulation display, play a decisive role behind the program is color separation parameters. The adjustment of the color separation parameters, will greatly affect the image of the conversion. At least, Photoshop This software has control of the color separation parameters. We specifically discussed in other articles.

Currently, very few pre-press department aware of the importance of RGB image data. Some departments have recognized the scanning and digital photography in color and revised version of the entire school during the save file should be RGB mode, and in all of the adjustment is completed, convert to CMYK. Because of these amendments through the school colors and RGB data, professional pre-press department can effectively document long-term storage. This makes the retrieval from the repository can be used in different image output devices (or other reproduction systems). This RGB image data for the emphasis in many publishing process produces a good effect, whether using system-level color separation is still using Photoshop color management method of image conversion method.

All kinds of printing, digital proofing device or computer monitor the effect of copying the same image should be strictly the same. In a separate color separation for each device when it is possible. Because the replication system in blue, products, generated between the yellow and black to produce a slightly different mix of similar appearance, it will make a separate color separation images look the same on different devices.

Observed (and measured) by the equipment to copy the color difference between the main method is to measure the required produce a neutral gray green, magenta and yellow content, which we call the gray balance reproduction system. If the image is converted to CMYK, then the re-use of different output devices, the image CMYK image requires adjusting the high light, the middle tones and shadow dot, and change the overall gray balance and color saturation. The amount of black image without compromising image quality is difficult to change, but if amendments black print image data, it will produce bad results.

For example, the original line for the high-quality sheet-fed printing press and dry the CMYK color separation images, if the cold-type printing web press will cause rubbing dirty. Compromise to amend CMYK images. RGB images can use a larger range of RGB colors to reproduce a more bright, more saturated colors. However, as the CMYK color separation in the image is, after all the pixels in the image are in the CMYK color range.

Archiving the entire printing industry development trend of RGB images, often encounter some of the experienced operators and color separation scanner specialists resistance. The old professionals in the use of rows of decorative, old-fashioned knob scanner technology to study the color separation. However, until the customer started their low-cost desktop CCD scanner to scan only heard of RGB image files for prepress. RGB image editing desktop scanner that became a threat, but a number of prepress technicians are despised in the RGB color correction and low-quality image capture connected.

In addition to RGB mode, Photoshop's Lab color mode is also good.

RGB is based on optical principles, but CMYK is the color pigments reflect light pattern. Lab has the advantage that it makes up less than the first two color mode. RGB blue and green in color between the over-many over the green and red color too little between, CMYK lost in the process of editing the color is more. Lab compensated in these aspects. Lab is also composed of three channels, L-illumination, which controls the brightness and contrast, a channel, including the color from dark green (bottom brightness values) to gray (in brightness) to sub-red light (high luminance values), b-channel including the color from light blue (bottom brightness values) to gray to yellow Focus (high brightness value). RGB mode with similar color mixing will result in brighter colors. Only the value of illumination channel changes only affect the color of light and shade. You can be seen as two-channel Lab RGB mode plus a luminance channel model.

Lab mode is device-independent, and can use this model to any one image editor. RGB mode and with the same speed, is several times faster than CMYK. Lab color mode conversion can guarantee that within CMYK color when there is no loss. In fact, whenever you convert CMYK to RGB image when, Photoshop will add an intermediate step, that is, converted to Lab mode.

Of course, to use hue, saturation and luminance (HSL) in the school color method, not the image is converted to Lab. Professional image-editing program (such as Photoshop) to RGB mode image by adjusting the HSL values, including the whole or a particular color, or between the basic colors in the HSL color values to school.

If you frequently use the Photo CD images, you can open directly to Lab mode, Kodak's proprietary YCC model is consistent with the Lab, so the conversion process will be a minimum loss of color.

For the above reasons, I edit the images in the time, if conditions allow, I tried first with Lab or RGB, converted to CMYK mode as a last resort. Once a CMYK image, do not easily turn back, and it is necessary, converted into Lab mode. (END)

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