Objective Detection Of Color Code Elements For Facial Care Display Boxes Image Quality Is Summarized

Objective detection of color code elements for Facial Care Display Boxes image quality is summarized

 

10% tone/highlight

Highlights are half-tone dots between 1% and about 20%. They are patches of uniform density printed with cyan, magenta, yellow, and black inks. These chromaticity values are useful for visually evaluating the platemaking process because oversensitization of positive plates can "shrink" or cause these small dots to be lost. These color blocks can also be used to measure the value of the highlight dot while the machine is running, some color scales even contain 3% to 5% dot.

 

25% tone/quarter tone

These even blocks contain a dot value of 25 percent and a more accurate quarter tone range of 20 to 40 percent. They are commonly printed in cyan, pinkish, yellow and black, sometimes overprinted in red, green and blue, and sometimes printed with three - and four-color gray balance elements.

 

50% chroma/midtone

These uniform color blocks contain a dot value of 50% and a more accurate half-tone range of 40% to 60%. They are often printed in cyan, pinny, yellow and black, sometimes overprinted in red, green and blue, and sometimes printed with three - and four-color gray balance elements.

 

Intermediate tone is very important for people to evaluate the quality of the image.

 

75% chroma/three-quarters tone

The three quarter point value is important to ensure sharp color in a particular printing process. For example, using 85% chroma in newspaper printing does not create a print contrast because this chroma value is usually printed in the field, so a 65% or 70% chroma value is sufficient when printing the newspaper. When choosing chrominance values for printing contrasts, determine a critical three-quarter chrominance value that will keep the color sharp under good printing conditions but clog up under bad printing conditions.

 

Dark tone

The darktone contains half step toning dot chromaticity values of about 85% or up to 95% and 98% of uniform color blocks. This chrominance value provides a basis for visual inspection of the platemaking process, as overexposed plates fill or block their empty areas. These objects can be used to measure the dot of the image's deep darkening area in machine reproduction.

 

Some color scale manufacturers stack both highlight and dark dots on a single color scale to facilitate rapid detection of extreme half-order dot duplication.

 

Monochromatic field

Field color blocks of each printing primary color can be used to measure field ink density, calculate dot expansion and printing contrast. The measurement of these color blocks can also be used to estimate the primary color chroma error and gray balance, which is very helpful for the determination of printing process characteristics.

 

Two color overprint

The two-color overprint field can be used to measure the veracity and gray balance of green, red and blue overprint in color printing.

 

Three color overprint

Three color overprint chroma is made up of equal amount of yellow, blue dot area. It is often used to detect color balance. Compared with gray balance block, it can print brownish colors.

 

Tri-color overprint field can be used to objectively measure the type of field density printed by tri-color on a press. The field overprint object also allows subjective and objective measurement of the accuracy of the third color overprint based on the first two colors already overprinted.

 

Four color black label block

Total dot area coverage refers to total area coverage (TAC) and these values are used to assess the total density after overprint. SWOP stipulates that the total amount of half-step tone in the dark part of the color separation process cannot exceed 300% (remember: in all four-color printing, 400% of the field part is the maximum); The color scale required in the publishing field usually includes a color block with a total dot area of 300%. Typically, the hue combination for this object requires about 79% green, 68% pinkish, 68% yellow, and 85% black. Conversely, the specification SNAP for Non-Heat Advertising Printing states that the total dot area should not exceed 260%. In the dark area of SNAP, the usual color separation chroma values range from 70% to 80% green, 70% to 80% pinny, 70% to 80% yellow, and 20% to 50% black.

 

The four-color black block can be used to measure the total dot area above, and it also takes into account the factors of alignment changes at this point on the hue curve. Sometimes these blocks are also used as background color remover in specifications where the actual image part also uses total dot area. In order to achieve this maximum value, the color separation method of background color removal is often used to reduce the half-order dot value and remove the color half-order dot value from the dark overprint area without affecting the visual effect of the shadow area of the image.

 

Color balance hexagon

The color balance hexagon developed by Brunner Systems is an element used to describe color balance transitions. The hexagon contains a gray balance color marker block of 50% green, 41% fine, and 41% yellow half-order chrominance overprint, indicating the effect of small dot expansion (including uneven dot expansion) during color conversion for the three printing primary colors. By measuring hexagon with densitometer and processing with special software, the dot expansion values of three printing primary colors can be displayed respectively.