How to test LPI of the line lenticular?
In lenticular production, transportation, storage, due to the difference in temperature, the number of lenticular lines will produce errors. In addition, the difference between printing and printing equipment also has an impact on the number of lines. In order to achieve the best three-dimensional effect, it is necessary to test the number of lenticular lines in each use.
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- Set the size of the paper. The width of the paper should be close to the size of the picture you are going to make; Set the DPI of the image. If you plan to print directly, it should be consistent with the highest resolution of the printer. If you are going to save it first and then print in other software, you can set it higher; generally, 1200, 600 DPI
- Set the approximate LPI value of the lenticular, that is, the number of lines in one inch lenticular. This number is estimated. The software will automatically put the number of lines and the number of adjacent lines together to generate a test table
- Setting amplitude refers to the LPI difference between two adjacent columns;
- Press the "create" button to create the test table;
- Press the "save" button to save the test form for other software (such as Photoshop) to call and print
- The printing paper and equipment should be the same as you will use for stereograms in the future. Because of different printing equipment and different printing paper, the measured value will be different.
- Overlay the printed, inkjet or printed test sheet with lenticular
- Align the raster slices. Rotate the direction of the lenticular so that the stripes seen in the rightmost vertical bar are perpendicular to your eyes
- Select the appropriate distance to view the image. Keep the viewing distance the same as your future work
- Look with one eye and shake left and right. From each test bar, look for all black or white test strips, and find test strips with fast black and white transformation. The faster the transformation between black and white is, the closer the value is. The larger the area of all black or white is, the closer to the true value
- If a very suitable test strip cannot be found, the closest LPI can be used as the estimated LPI to reduce the amplitude to improve the test accuracy and retest. Until we find the right one.