Three-dimensional reflectivity map 3 (I want to see the figure (click to enter): Figure 3a, Figure 3b, Figure 3c, Figure 3d)
Figure 3 shows the three-dimensional reflectance distribution of the surface of the print, measured by the progressive deflection angle of the test sample, and the resulting specular component being measured by the test pattern of Figure 3 at different deflection angles.
When removed, the three-dimensional reflectance distribution of the printed material.
In the figure, the three-dimensional reflectance distribution of the special paper has only diffuse reflection light and is very similar at each deflection angle. Glossy films and glossy papers have almost the same diffusion angle (having equal halfbands at a deflection angle of 1° in the figure). However, with the increase of the deflection angle, the half-band width of the glossy film suddenly increases, while the change of the glossy paper is very small.
The width of the half-band greatly affects the quality of the image. If the width of the half band is large, the light scattering is large and the image sharpness becomes smaller. Glossy half-band narrow, high color image, high resolution. However, the chroma on the glossy film will be lower. No good image effects can occur on special paper because the semi-band width of the reflection curve is infinite.
Figure 4 (I want to see the figure (click to enter): Figure 4a, Figure 4b, Figure 4c, Figure 4d)
Figure 4 shows the three-dimensional reflectivity distributions of real black, blue, yellow, and pragmatic blocks printed on glossy and glossy paper. The deflection angle tested is 2.5°. In the previous experiments, we see that The half width of glossy paper is narrower than glossy film, indicating that the image will get higher chroma. In this figure, we can see all the ink colors, the print color and the image are affected by the type of printed material.
Figure 4 Comparison of three-dimensional reflectance distributions of black, blue, yellow and magenta solid blocks printed on glossy film and glossy paper with a test drift angle of 2.5°
Figure 5 (I want to see the icon (click to enter): Figure 5)
Figure 5 shows the optical tracking needle distribution along the X-axis reflection density on glossy films and glossy papers, and provides analytical information (surface texture) on good surface conditions. The measurement of the reflectance was carried out by moving the proofs at a length of 40 mm at intervals of 0.1 mm, and the dispersion factor was calculated for each point.
The light intensity curve of glossy paper is more dispersed, indicating that the surface is rougher than the glossy film.
Figure 5 Reflectance density distribution on glossy films and glossy paper, measured using optical trace needles
The goniophotometer measures the relationship between the light scattering rate and the angle change when the illumination or observation angle changes. The device is very useful in photo interpretation, surface smoothness or roughness, blur, image clarity.
GP-200 three-dimensional automatic goniophotometer Figure 6 (I want to see the icon (click to enter): Figure 6a, Figure 6b, Figure 6c)
Figure 6 shows the spectral reflectance distributions of three print materials when printed with magenta inks. Figure 6 shows the measurement of the spectral reflectance distribution of test materials printed with magenta ink using a goniometric spectrophotometer.
The incident angle is between -30° and 80°. Although according to the observation angle, the change in the spectral characteristics is very small for the paper, the high reflectance value in the absorption wavelength region leads to the effect of the low chroma peace.
The reflectance distribution of glossy and glossy films varies greatly with viewing angle. In addition, when the near mirror image 7 changes with the observation angle, the chromaticity changes occurring on the special paper (a), the glossy paper (b), and the glossy adhesive sheet ©.
With a reflection angle (45°), the reflectance distribution curve will be smoother, that is, the gloss will be stronger.
Figure 7a-7c (I want to see the illustration (click to enter): Figure 7a, Figure 7b, Figure 7c)
Figures 7a-7c show the change in chromaticity after solid patches of cyan, magenta, and yellow ink are printed on each material as the viewing angle changes. The chromaticity value of the special paper will squeeze in a very small range within the observation angle range of -30° to 80°. However, the chromaticity locus of glossy paper and glossy film reached the achromatic position. The graph shows that the change between glossy paper and glossy film is closely linked to the difference in print colors on the two materials.
The test results of reflectance and color change show that three kinds of printing materials use inkjet technology to print the quality effect of color images, in which the effect of glossy paper has a higher chroma value and the images are more distinctive.
These tests using the Murakami Automated Angle-of-View Photometer GP-200 and the Angle-Spectrum Spectrocolor Test System GCMS-3 can be used in print measurements of Other printed materials and inks to help print higher-quality images on selected presses. .
(End of the article)
Medycon Machinery Co., Ltd. , http://www.zjghospitalbed.com