Choose a dither option from the menu, and enter a percentage value for the dither amount. A higher amount dithers more colors but may increase file size. You can choose from the following dither options:. Does not dither colors but instead uses the color closest to the missing color. This tends to result in sharp transitions between shades of color in the image, creating a posterized effect.
Uses an error-diffusion method that produces a less-structured dither than the Pattern option. To protect colors in the image that contain entries in the color table from being dithered, select Preserve Exact Colors. This is useful for preserving fine lines and text for web images. Helps to reduce seam patterns along the edges of image slices. Choose this option if you plan to slice the image for placement in an HTML table. Buy Adobe Photoshop or start a Free Trial.
Legal Notices Online Privacy Policy. Buy now. Convert between color modes Search. Make it. Convert an image to another color mode. Modes not available for the active image appear dimmed in the menu. Convert an image to Bitmap mode. Do one of the following:. For Output, enter a value for the output resolution of the Bitmap mode image, and choose a unit of measurement.
By default, the current image resolution appears as both the input and the output resolutions. Choose one of the following bitmap conversion methods from the Use pop-up menu:. Enter values in the Halftone Screen dialog box: For Frequency, enter a value for the screen frequency, and choose a unit of measurement.
For Shape, choose the dot shape you want. Convert a color photo to Grayscale mode. Open the photo you want to convert to black-and-white. Click Discard. Photoshop converts the colors in the image to black, white, and shades of gray. Convert a Bitmap mode image to Grayscale mode. Enter a value between 1 and 16 for the size ratio. Convert a grayscale or RGB image to indexed color. All visible layers will be flattened; any hidden layers will be discarded.
Select Preview in the Indexed Color dialog box to display a preview of the changes. Specify conversion options. One way to avoid this is by using Photoshop's native colour management system.
Here you'll find your colour options, and you can simply select CMYK. Once you do that, Photoshop will give you a warning letting you know that you are about to convert to CMYK using the specific profile that will be listed in the warning. The warning lets you know that this may not be what you intend to do and it even shows you where you can go to choose the correct profile. Once you click OK you should see a slight shift in colour. You are now in the CMYK colour space.
While the two are very similar, they also have some distinct differences that. Welcome back! You've successfully signed in. Your account is fully activated, you now have access to all content.
Your billing info is updated. Billing info update failed. What is CMYK? Why Does the Color Mode Matter? InDesign InDesign is the best program to use when designing for print, because designing for print is its purpose by default.
Illustrator You must ensure that you are setting the color mode to CMYK while creating a new document. Grayscale mode uses different shades of gray in an image. Every pixel of a grayscale image has a brightness value ranging from 0 black to white. Grayscale mode uses the range defined by the working space setting that you specify in the Color Settings dialog box.
Bitmap mode uses one of two color values black or white to represent the pixels in an image. Duotone mode creates monotone, duotone two-color , tritone three-color , and quadtone four-color grayscale images using one to four custom inks.
When converting to indexed color, Photoshop builds a color lookup table CLUT , which stores and indexes the colors in the image. If a color in the original image does not appear in the table, the program chooses the closest one or uses dithering to simulate the color using available colors.
Although its palette of colors is limited, indexed color can reduce file size yet maintain the visual quality needed for multimedia presentations, web pages, and the like. Limited editing is available in this mode. For extensive editing, you should convert temporarily to RGB mode.
Multichannel mode images contain levels of gray in each channel and are useful for specialized printing. Buy Adobe Photoshop or start a Free Trial. Legal Notices Online Privacy Policy.
0コメント