{"id":78,"date":"2012-12-12T07:09:58","date_gmt":"2012-12-12T07:09:58","guid":{"rendered":"http:\/\/www.vicgi.com\/blog\/?p=78"},"modified":"2023-11-22T23:48:45","modified_gmt":"2023-11-22T23:48:45","slug":"lenticular-pitch-test-using-photoshop","status":"publish","type":"post","link":"https:\/\/www.vicgi.com\/blog\/2012\/12\/12\/lenticular-pitch-test-using-photoshop\/","title":{"rendered":"Lenticular Pitch Test Using Photoshop"},"content":{"rendered":"<p>Although it&#8217;s still informative, this post is outdated.\u00a0 Unless you are a software developer who wants to understand the theory behind pitch tests, we have created an online lenticular printing pitch test pattern creation APP for you at<\/p>\n<p><a href=\"https:\/\/www.vicgi.com\/lenticular-pitch-test.html\">https:\/\/www.vicgi.com\/lenticular-pitch-test.html<\/a><\/p>\n<h1>Introduction<\/h1>\n<p>If you have been following the <a href=\"http:\/\/www.vicgi.com\/lenticular-tutorials.html\">tutorials<\/a> we have published (such as <a title=\"3D Lenticular Printing Interlacing Algorithm Illustrated Using Photoshop\" href=\"http:\/\/www.vicgi.com\/lenticular-interlacing-algorithm.html\" target=\"_blank\" rel=\"noopener\">3D Lenticular Printing Interlacing Algorithm Illustrated Using Photoshop<\/a> and <a title=\"Converting a 2D picture to a 3D Lenticular Print - Theory and Tutorial\" href=\"http:\/\/www.vicgi.com\/2d-to-3d-lenticular.html\" target=\"_blank\" rel=\"noopener\">Converting a 2D picture to a 3D Lenticular Print<\/a>) you must have encountered a term called &#8220;Pitch Test&#8221;.<\/p>\n<p>The Pitch test is a very important step and one must not skip. 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.\u00a0\u00a0 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\u2019s technical specification.\u00a0 Likewise, the technical data published by the maker of the printer you are using must be accurate also.<\/p>\n<p>Environmental factors such as temperature and humidity might also affect the result of a pitch test.<\/p>\n<p>For example, a <a title=\"lenticular lens\" href=\"http:\/\/en.wikipedia.org\/wiki\/Lenticular_lens\" target=\"_blank\" rel=\"noopener\">lenticular sheet<\/a> with a published specification of 40 LPI maybe 40.1 LPI.\u00a0 The extra 0.1 LPI will be a catastrophe if it is not accounted for.\u00a0\u00a0 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.\u00a0 The purpose of the pitch test is to identify such deviations so that miss-alignment can be avoided.<\/p>\n<p>Much integrated lenticular printing software such as <a title=\"PhotoProjector\" href=\"http:\/\/www.3dphotopro.com\/interlacing_software.html\" target=\"_blank\" rel=\"noopener\">PhotoProjector<\/a>, <a title=\"Imagiam\" href=\"http:\/\/www.imagiam.com\/imagiam.html\" target=\"_blank\" rel=\"noopener\">Imagiam<\/a>, <a title=\"PhotoIllustion\" href=\"http:\/\/www.photo-illusion.com\" target=\"_blank\" rel=\"noopener\">PhotoIllustion<\/a>, and SuperFlip have built-in pitch test functions.\u00a0 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\u00a0 pitch test pattern by yourself.\u00a0 This is the purpose of this article.<\/p>\n<h1>The Theory of Lenticular Pitch Test<\/h1>\n<p>As usual, we are going to review a little bit of math first. Let us use a 40 LPI lenticular sheet as an example.\u00a0 Since there are 40 lenticules per inch, therefore<\/p>\n<p>Width of each lenticule = 1 \u00f7 40 = 0.025 inch<\/p>\n<p>Now depends on whether you are going to print your pitch test pattern using Epson (<a title=\"Epson Artisan 50\" href=\"http:\/\/www.epson.com\/cgi-bin\/Store\/jsp\/Product.do?sku=C11CA45201\" target=\"_blank\" rel=\"noopener\">Artisan 50<\/a> for example) at 720 DPI or HP\/Canon at 600 DPI, the number of pixels to represent 0.025 inch will be different.\u00a0 In this tutorial, we will use Epson 720 DPI printer as an example.\u00a0 You can easily deduct the numbers if you are using HP or Canon or any other 600 DPI printers.<\/p>\n<p>At 720 DPI, there will be 18 pixels in 0.025 inch because 720 x 0.025 = 18 as shown in the picture below.<\/p>\n<figure id=\"attachment_79\" aria-describedby=\"caption-attachment-79\" style=\"width: 339px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/width-of-lenticule.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-79\" title=\"Width of a lenticule for pitch test purpose\" src=\"http:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/width-of-lenticule.gif\" alt=\"width of a lenticule\" width=\"339\" height=\"285\" srcset=\"https:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/width-of-lenticule.gif 339w, https:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/width-of-lenticule-300x252.gif 300w\" sizes=\"auto, (max-width: 339px) 100vw, 339px\" \/><\/a><figcaption id=\"caption-attachment-79\" class=\"wp-caption-text\">Width of a lentucule<\/figcaption><\/figure>\n<p>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).\u00a0 So there will be 9 pixels of black stripe and 9 pixels of white stripe in an alternating pattern.\u00a0 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.<\/p>\n<h1>Pitch Test Pattern Around the Ideal Neighborhood<\/h1>\n<p>By the same deduction we can conclude that when the LPI\u00a0 is 40.1, the width of each lenticule will be 1 \u00f7 40.1 = 0.02494 inch.\u00a0 Again at 720 DPI the number of pixels should be 17.955 pixels. Since pixel is the smallest unit we can use, i.e. 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.<\/p>\n<p>From the numbers we have derived above, i.e. 0.025 inch @ 40 LPI and 0.02494 inch @ 40.1 LPI, we can see that we need to re-size the stripes.\u00a0 This is where we can use Photoshop&#8217;s re-size feature to accomplish this!<\/p>\n<p>Re-sizing from 0.025-in to 0.02494-in is equivalent to reducing the artwork (002494 \u00f7 0.024) x 100%, or<\/p>\n<p>1\/40.1 \u00f7 1\/40 = 40 \u00f7 40.1 = 0.997506 = 99.7506 %<\/p>\n<p>From Photoshop go to [Image] &gt; [Image Size\u2026] we can bring up the re-size dialog as shown<a href=\"http:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/resize.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-81 aligncenter\" title=\"Resize a pitch test stripe using percentage\" src=\"http:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/resize.gif\" alt=\"\" width=\"457\" height=\"369\" srcset=\"https:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/resize.gif 457w, https:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/resize-300x242.gif 300w\" sizes=\"auto, (max-width: 457px) 100vw, 457px\" \/><\/a><\/p>\n<p>Uncheck the [Constrain Proportions] checkbox so the height can be kept at the original, then change the way you want to re-size from [Pixels] to [Percent] as shown above.<\/p>\n<p>For the other LPIs, we can use a spreadsheet to calculate the re-sizing percentage as shown below. The formulae for cell B2, for example, will be = 40 \/ A2. \u00a0You can then copy and paste cell B2 to the other cells and format the column to display in percentage.<\/p>\n<figure id=\"attachment_82\" aria-describedby=\"caption-attachment-82\" style=\"width: 250px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/resizing-spreadsheet.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-82\" title=\"Calculate the resizing percentage using a spreadsheet\" src=\"http:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/resizing-spreadsheet.gif\" alt=\"Calculate the resizing percentage using a spreadsheet\" width=\"250\" height=\"285\" \/><\/a><figcaption id=\"caption-attachment-82\" class=\"wp-caption-text\">Calculate the resizing percentage using a spreadsheet<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<figure id=\"attachment_83\" aria-describedby=\"caption-attachment-83\" style=\"width: 257px\" class=\"wp-caption alignleft\"><a href=\"http:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/pitch-test-stripes.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-83\" title=\"Lenticular Printing Pitch Test Pattern\" src=\"http:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/pitch-test-stripes.gif\" alt=\"Lenticular Printing Pitch Test Pattern\" width=\"257\" height=\"775\" srcset=\"https:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/pitch-test-stripes.gif 257w, https:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/pitch-test-stripes-99x300.gif 99w\" sizes=\"auto, (max-width: 257px) 100vw, 257px\" \/><\/a><figcaption id=\"caption-attachment-83\" class=\"wp-caption-text\">Lenticular Printing Pitch Test Pattern<\/figcaption><\/figure>\n<p>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.<\/p>\n<p>Vertical lines should also be printed along the edges to guide the alignment.<\/p>\n<p>When we put a lenticular sheet over the pitch test pattern, we can determine the optimum setting by choosing the one that shows either solid black or solid white when we look at them with a side-to-side viewing orientation.<\/p>\n<p>As shown in the picture below, the accurate LPI is proven to be 40 LPI. This is the 40 LPI, 8 x 10 inch lenticular sheet with adhesive backing you can purchase from us. Lens sold by us have been tested to be precise but that does not give us the reason to skip the pitch test. \u00a0To be more accurate, we can even create a test pattern up to two decimal points with the same principles.<\/p>\n<p>You can download the completed Photoshop pitch test pattern for 40 LPI from the link below.<\/p>\n<p><a title=\"40 lpi lenticular printing pitch test sample\" href=\"http:\/\/www.vicgi.com\/images\/pitch-test-stripes.psd\">40 lpi pitch test<\/a> ( a 71.1 MB file)<\/p>\n<h1>\u00a0<\/h1>\n<p><a href=\"http:\/\/www.vicgi.com\/blog\/2012\/12\/12\/lenticular-pitch-test-using-photoshop\/final-pitch-test-pattern\/\" rel=\"attachment wp-att-86\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-86 aligncenter\" src=\"http:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/final-pitch-test-pattern.jpg\" alt=\"final-pitch-test-pattern\" width=\"400\" height=\"482\" srcset=\"https:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/final-pitch-test-pattern.jpg 400w, https:\/\/www.vicgi.com\/blog\/wp-content\/uploads\/2012\/12\/final-pitch-test-pattern-248x300.jpg 248w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/a><\/p>\n<h1>Conclusion<\/h1>\n<p>We can&#8217;t emphasize more the importance of conducting a pitch test for any lenticular printing project.\u00a0 Without a pitch test, you are under the mercy of the published datasheet. \u00a0Even if that is the case, your printer may not be printing at the exact resolutions you want.\u00a0 It is a misnomer that a lenticular sheet has been calibrated at a certain LPI because pitch test is for testing the combination of lenticular sheet and printer (and also the type of paper sometimes), and not just the lenticular sheet alone.<\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>Although it&#8217;s still informative, this post is outdated.\u00a0 Unless you are a software developer who wants to understand the theory behind pitch tests, we have created an online lenticular printing pitch test pattern creation APP for you at https:\/\/www.vicgi.com\/lenticular-pitch-test.html Introduction If you have been following the tutorials we have published (such as 3D Lenticular Printing&#8230;<\/p>\n<p class=\"more-link-wrap\"><a href=\"https:\/\/www.vicgi.com\/blog\/2012\/12\/12\/lenticular-pitch-test-using-photoshop\/\" class=\"more-link\">Read More<span class=\"screen-reader-text\"> &ldquo;Lenticular Pitch Test Using Photoshop&rdquo;<\/span> &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":86,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[10,12,11,13,14],"class_list":["post-78","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lenticular-printing","tag-lenticular-printing-2","tag-photoshop","tag-pitch-test","tag-pitch-test-pattern","tag-pitch-test-stripes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - 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