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--- lentikularna_slika [2021/06/29 15:18] – [Lentikularna slika] dp
+++ lentikularna_slika [2022/08/08 20:17] (current) – old revision restored (2021/06/29 15:53) 18.212.85.59
@@ Line 4: / Line 4: @@
 Lentikularna slika je kombinacija više slika preko kojih je postavljena leće kako bi se ostvario doživljaj dubine, pokret ili neka druga promjena, u odonsu na kuta gledanja. Tehnologija se koristi u tisku i u digitalnim medijima (3D ekrani).
-Lenticular printing is a multi-step process which consists of creating a lenticular image from at least two images, and combining it with a lenticular lens. This process can be used to create various frames of animation (for a motion effect), offsetting the various layers at different increments (for a 3D effect), or simply to show a set of alternative images which may appear to transform into each other. Once the various images are collected, they are flattened into individual, different frame files, and then digitally combined into a single final file in a process called interlacing.
+FIXME
-From there the interlaced image can be printed directly to the back (smooth side) of the lens, or it can be printed to a substrate (ideally a synthetic paper) and laminated to the lens. When printing to the backside of the lens, the critical registration of the fine "slices" of interlaced images must be absolutely correct during the lithographic or screen printing process or else "ghosting" and poor imagery might result. Ghosting also occurs on choosing the wrong set of images for flip.
-When most people think of a hologram, they're probably thinking of what's called a lenticular lens print. Lenticular lenses can be used to create the illusion of depth and are the technology that makes possible 3D Game Boys and TV's that don't require special eye glasses.
 {{ :tabula_scalata.jpg?nolink |}}
 [[https://en.wikipedia.org/wiki/Tabula_scalata|Tabula scalata]]
+https://www.youtube.com/watch?v=fJ8TN_ptzfY
-====== Optika ======
-https://setosa.io/blog/2014/07/07/lenticular/
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@@ Line 32: / Line 26: @@
   * računalo
   * printer (što veće rezolucije)
+----
+====== Optika ======
+Interaktivni eksperiment:
+https://setosa.io/blog/2014/07/07/lenticular/
+FIXME
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 ====== Odabir i priprema motiva ======
-  * 3D ili pokret?
+  * 3D ili pokret
   * horizonatlni ili vertikalni smjer animacije (ovisno o orijentaciji leća/folije)
   * najčešće manje //freame//-ova znači bolja separacija slika i manje //ghosting//-a
@@ Line 55: / Line 57: @@
 https://dplenticular.com/technology/lenticular-effects/
-====== Izrada slika ======
+----
-Proces izrade svodi se .... interlaceanje....
+====== Izrada slika ======
 {{youtube>4pUIixvdLTE?large}}
+Tipični proces izrade lentikularnih slika korištenjem komercijalnih alata
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-====== Software ======
+===== Software =====
-Postoji nekoliko programa namjenjenih stvaranju ovakvih slika. S obzirom na to da je dio tih rješenja kokomercijalan ili rade samo na pojedinim operativnim sistemima – za potrebe ove radionice napravljen je poseban program. On ujedno služiti kao demonstracija stvaranja relativno jednostavnih alata kakve možemo koristiti za postizanje kompleksnih slika.
+Postoji nekoliko programa namjenjenih stvaranju ovakvih slika. S obzirom na to da je dio tih riješenja komercijalan ili rade samo na pojedinim operativnim sistemima – za potrebe ove radionice napravljen je poseban program. On ujedno služiti kao demonstracija stvaranja relativno jednostavnih alata kakve možemo koristiti za postizanje kompleksnih slika.
 Program je napisan u Processingu, programskom jeziku prilagođenom radu s grafikom i baziranom na Javi. Kako biste ga koristili potrebno je skinuti i instalirati [[https://processing.org/|Processing]], te skinuti program i otvoriti ga.
@@ Line 71: / Line 74: @@
 https://github.com/izumitelj/lenticular_interlacer
-===== Upute za korištenje =====
+=== Upute za korištenje ===
   - Pronađite ili kreirajte animaciju, vodeći računa o prethodnim preporukama
@@ Line 78: / Line 81: @@
   - Otvorite program ''leticular_processing.pde'' u Processingu
   - Podesite varijable ''imagesFolder'' ''fileExtension'' i ''framesTotal'' prema vašoj animaciji
-  - Pokrenite sketch ►
+  - Pokrenite program/sketch ►
   - U direktoriju programa pojaviti će se kompozitna slika i istoimeni tekstualni file sa specifikacijom za print
-===== Related =====
-  * 2D lenticular array, micro lenses https://www.youtube.com/watch?v=fJ8TN_ptzfY
-  * 1D or 2D lenticular array https://www.youtube.com/watch?v=vk5K9ww5QBc
-  * https://www.youtube.com/watch?v=ktgbtoCD58I
-  * fun experiment https://amp.reddit.com/r/Damnthatsinteresting/comments/di6geb/lenticular_lenses_can_be_used_to_blur_images/
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@@ Line 91: / Line 90: @@
 ====== Najčešći problemi ======
-prevent ghosting
+FIXME
   * http://www.outeraspect.com/lenticular_design_guide.php
   * https://lenticularworld.com/how-to-prevent-ghosting/
   * https://www.lenstarlenticular.com/do-and-donts-lenticular-design
-Along with moving the camera horizontally it's critical to also have the camera focus on one point in the scene. If you're using three.js - there's a simple camera.lookAt(object) method which allows for this 'focus' very easily. Wherever your camera is focused will become the middle ground in your 3D scene. Things further than this focus point will seem to fall into the lenticular and things closer will pop out of the lenticular. If you are rendering an image of a human head - you may want the focus point to be the center of the head so that the nose and forehead stick out of image and the background recedes into the distance. If you want the head to appear inside the lenticular then use the tip of the nose as the focus point.
-After you run the program, open your final output in photoshop and go to Image > Image Size in the top menu. In here, uncheck resample and make the resolution to 300dpi (Processing outputs it at 72dpi naturally). Unchecking this will allow for the pixels to remain unchanged and keep everything crisp for the printer. F
 ===== Aligning lens to print =====
@@ Line 104: / Line 102: @@
 {{youtube>6UWR6zGuI2A?large}}
-===== Pitch calibration =====
-The ''pitch test'' is conducted once for every printer type, for every paper type, for every type of printer settings and for every lens type.
+----
+===== Kalibracija =====
+Za vrlo kvalitetnu reprodukciju često je potrebno napraviti tzv. //pitch test//. Radi se o malim korekcijama rezolucije kako bi se kompenzirale, male ali u ovom slučaju vidljive nepreciznosti printera, papira i lentikularnih folija.
   * https://triaxes.com/docs/legend/Legend-en/28Lenticularimagecreation.html
   * https://triaxes.com/docs/Pitch-test-en/Description.html
-D lenticular arrays
-magnify surfaces
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@@ Line 126: / Line 124: @@
 ====== Printanje ======
-Lenticular is a HIGH RESOLUTION process as the lenticular sheet is magnifying the data that is printed to the backside of the lens. Our clients are offset or digital printers, printing at high res. like 400 LPI or even more.
+Ovakav tip slika zahtjeva vrlo visoke rezolucije s obzirom na to da su lentikularne folije povećavaju sadržaj koji se nalazi ispod njih.
-Potrebno je isprintati sliku na točno definiranoj dimenziji ili rezoluciji (tekstuali file uz generiranu sliku), u protivnom slika neće biti funkcionalna. Osim toga, moguće je da sam printer doprinosi malim pomacima pa se ponekad mogu dobiti bolji rezultati ako je još ručno poštima (poveća ili smanji) slika.
-----
-====== Kinegram ======
+.4 mm / 50 lpi = 0.508 mm
-Sličan princip. Za vježbu možete probajti modificirati prethodno priloženi program kako bi generirali grafiku za kinegram.
+leća = 0.508 mm / br. //frame//-ova!
+Kako bi efekt bio uspješan potrebno je isprintati sliku na točno određenoj fizičkoj dimenziji ili rezoluciji. Program generira tekstualni file uz sliku u kojem se nalaze sve potrebne informacije. Osim toga, moguće je da sam printer ne preproducira savršeno precizno standardnu rezuluciju, pa se ponekad mogu dobiti bolji rezultati ako je još ručno poštima (poveća ili smanji) slika.
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