The main points to pay attention to in color quality control

The key points to pay attention to when making color quality control:

(1) The accuracy and stability are the prerequisites for selecting a digital proofing system in the market; if it is not possible to meet these two requirements, it is not a reliable digital proofing system.

(b) The main factors affecting the digital proofing system are: printing speed, operating costs and color management.

(C) Printing Speed: In terms of speed, the market can already find a high-resolution draft proof in 10 minutes.

(D) operating costs: It depends mainly on the price of ink and special paper for proofing.

(5) Color management: It depends on accuracy and stability. It is also the most important factor. Even if the speed is faster, the cost will be lower. If the printing effect cannot be accurately and steadily previewed, it may lead to incur printing on the subsequent stage. Big economic and time loss.

(6) Digital proofing color evaluation:

1. The methods used to evaluate colors are:

(1) Visual Inspection - Subjective Evaluation (Color Management)

(2) Measurement - Device Calibration

2. The focus of color assessment:

(1) Single Color Block - Single Color Stimuli

(2) Measurement method - Test target test guide

(3) Complex Image - Complex Color Image

(4) Visual inspection - Standard Test Image standard proofs

3. Comparison of color assessment

Category Subjective Evaluation Objective Evaluation Method Visual Measurement Method Test Image Standard Image Test Target Test Guide Use Color Conversion Device Correction (7) Color Difference

Finally, when we talk about color control, there is a concept we can not fail to mention, because manufacturers, customers, or printers must pay attention to the problem of color difference in order to maintain the color consistency of what they see.

1. Definition of Color Difference: It refers to the difference in the color of the eye when comparing two color objects, abbreviated as ΔE.

2. The commonly referred to ΔE is the color difference formula of CIELAB uniform color space developed by CIE in 1976. ΔE=[(L1-L2)2+(a1-a2)2+(b1-b2)2]1/2

3. In general

(1) ΔE > 6: Unacceptable, human eye vision can easily identify its color difference.

(2) ΔE < 4: It is still acceptable, but the human eye can discern its color difference, but it is not very obvious.

(3) ΔE < 2: The visual difference of the human eye can hardly be discriminated.