Vertical lines should also be printed along the edges to guide the alignment. Once re-sized, we can copy and paste to a letter size canvas as shown on the left and print it out on your target printer at the desired resolutions, 720 DPI on any Epson inkjet printer for example. Calculate the resizing percentage using a spreadsheet Lenticular Printing Pitch Test Pattern You can then copy and paste cell B2 to the other cells and format the column to display in percentage. The formulae for cell B2, for example, will be = 40 / A2. Uncheck the checkbox so the height can be kept at the original, then change the way you want to re-size from to as shown above.įor the other LPIs, we can use a spreadsheet to calculate the re-sizing percentage as shown below. This is where we can use Photoshop’s re-size feature to accomplish this! 0.025 inch 40 LPI and 0.02494 inch 40.1 LPI, we can see that we need to re-size the stripes. we cannot create a 0.955 pixel dot, we will need to use this new set of numbers to create a new black and white pattern.įrom the numbers we have derived above, i.e. Since pixel is the smallest unit we can use, i.e. Again at 720 DPI the number of pixels should be 17.955 pixels. Pitch Test Pattern Around the Ideal Neighborhoodīy the same deduction we can conclude that when the LPI is 40.1, the width of each lenticule will be 1 ÷ 40.1 = 0.02494 inch. In this pattern, a perfect 40 LPI sheet will show a flipping effect where viewers will see either a solid black pattern or a solid white pattern by a side-to-side viewing orientation. So there will be 9 pixels of black stripe and 9 pixels of white stripe in an alternating pattern. Our plan is to create a pattern where half of a lenticule will have a black stripe and the other half to have a white stripe as seen in the above picture (width of a lenticule). You can easily deduct the numbers if you are using HP or Canon or any other 600 DPI printers.Īt 720 DPI, there will be 18 pixels in 0.025 inch because 720 x 0.025 = 18 as shown in the picture below. In this tutorial, we will use Epson 720 DPI printer as an example. Now depends on whether you are going to print your pitch test pattern using Epson ( Artisan 50 for example) at 720 DPI or HP/Canon at 600 DPI, the number of pixels to represent 0.025 inch will be different. Width of each lenticule = 1 ÷ 40 = 0.025 inch Since there are 40 lenticules per inch, therefore ![]() Let us use a 40 LPI lenticular sheet as an example. This is the purpose of this article.Īs usual, we are going to review a little bit of math first. But if you have followed our tutorials and prefer to just use bare bone Photoshop to accomplish a 3d printing project then you will need to create a pitch test pattern by yourself. ![]() #2 SIDED PRINTER TEST SHEET SOFTWARE#Much integrated lenticular printing software such as PhotoProjector, Imagiam, PhotoIllustion, and SuperFlip have built-in pitch test functions. The purpose of the pitch test is to identify such deviations so that miss-alignment can be avoided. A printer printing at the published 720 DPI (Dot per Inch) may also deviate from the specification and print at a slightly higher or lower resolution. The extra 0.1 LPI will be a catastrophe if it is not accounted for. Likewise, the technical data published by the maker of the printer you are using must be accurate also.Įnvironmental factors such as temperature and humidity might also affect the result of a pitch test.įor example, a lenticular sheet with a published specification of 40 LPI maybe 40.1 LPI. In other words, we need to ensure a 40LPI (Lenticule Per Inch) lenticular sheet has exactly 40 lenticules per inch as stated by the lenticular sheet maker’s technical specification. ![]() Simply put, the need for a pitch test is to avoid miss-alignment between the lenticules on the lenticular sheet and the interlaced image that is ready for printing. The Pitch test is a very important step and one must not skip. If you have been following the tutorials we have published (such as 3D Lenticular Printing Interlacing Algorithm Illustrated Using Photoshop and Converting a 2D picture to a 3D Lenticular Print) you must have encountered a term called “Pitch Test”.
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