![]() Epson Pro 3800/3880 installation. You can print this document after you break this document from this frame! Click here to break this document free! Shop Digital Cameras, 35MM Camera Equipment, Photo Printers, Home Theater, DVD Players, Authorized Dealer Canon. Free Expedited Shipping for most orders over $49. Returns Shop With Confidence Easy 30-Day Return Policy. Digital Negatives Part 2 . So, I best post a more complete explanation of the product itself, the process in how it is used, and how it differs from a regular Piezography printing system. Explanation. Piezography digital film is a subset of Piezography that uses a modified Selenium MPS ink shade set and a unique QTR curve. The modification to the inks are in positions shade 2 and shade 4. These two shades have been modified to make them lighter so that a curve could be devised for QTR that would result in a smooth linearization on Pictorico Ultra OHP film. Without this modification, the Piezography profiler can not devise a smooth output linearization on film and the output looks poor as below: A poor linearization will occur during printing if a perfect QTR curve is not created. This is how the Piezography output should appear. Perfectly smooth, no posterizations over visible ink overlaps. By the way – you can click on the images on our website to make them larger! The Pictorico film absorbs ink in the way that requires modification to shades 2 & 4. So it requires a dedicated ink system that can no longer be used for making prints without changing shades 2 & 4 back to the normal Piezography dilutions. A single curve has been devised that will perform exceptionally well on Pictorico Ultra OHP film. The curve will print a 2. A contrast gamma of 2. The dynamic range of the ink is so wide that as is, it can be used to make magnificent backlit images by printing on white film. He solely prints from digital negatives. Have you looked into Mark Nelson’s Precision Digital Negatives. Free Download Cengage Advantage Books: Psychology: Modules for Active Learning with Concept Modules with Note-Taking and Practice Exams (Thomson Advantage Books) by Dennis Coon, John O. Wholesale precision digital from China precision digital Wholesalers Directory. My AliExpress; My Orders; Message Center; Wish List; My Favorite Stores; My Coupons. ImageMagick supports a number of image format specifications which refer to images prepared via an algorithm, or input/output targets. The following table lists these pseudo-image formats. However, it must be modified by the user when making digital negatives and positives for both traditional and non- traditional photographic processes according to the limitations of these processes. This is ideally modified in a single Photoshop curve that will convert 2. Because Piezography prints this narrow dynamic range of tone with thousands and thousands of gray shades, fidelity is not compromised. More info in this box awaits those curious about the QTR curves architecture.. You are looking at Quad. Tone RIP curves which I have made for Roy Harrington’s Quad. Tone RIP software. The curves are actually a composite of seven individual curves that control the output of each inkjet head. Each curve represents a shade of Piezography ink. The darkest shade is on the right and the lightest shade is on the left. A very good explanation of QTR curves can be found in the blog by browsing the Piezography K7 inks and K7 curves category for Piezography Profiles. Notice that although this is an eight ink printer, there is no LLK curve. That position in the printer is reserved as a dummy containing Piezo. Flush or as a Gloss overprint channel containing GO. It gets a curve all of its own. The curves are represented by color position rather than shade. The curves architecture for film and paper are dramatically different. The QTR curve for Pictorico film at the top features a very heavy black. Shade two (in the cyan position) had to be diluted lighter to fill in the gap between black and shade 3 (in the light cyan position). Shade 4 (in the magenta position) also had to be diluted lighter to fit between shades 3 and 5 (in the light magenta position). Shades 6 and 7 in light black and yellow positions complete the linearization. Below the QTR film curve is the QTR curve for Hahnemuhle Photo Rag. It is very smooth and seems to not have any lumps and bumps because the Master Curve was created on this paper, and it has needed only a slight ajustment. All curves that we create produce fantastically smooth output no matter how lumpy and bumpy they look. ![]() QTR curves have absolutely NOTHING to do with Photoshop curves, although I use Photoshop curves to illustrate the concept of QTR curves in the blog post “Piezography Profiles”. Process. For backlit printing, an image may be printed directly with the QTR curve New. S9a. NG2b- Pictorico. UPohp. quad. The film can then be inserted into a backlit frame, although I recommend inserting behind the film positive some additional translucent white film to “taste” in order to reduce the brightness to photographic levels. I like my backlits much dimmer than the current new superbright led frames which are designed to reach 1. The dynamic range of a Piezography backlit can be nearly 4. I have a very special black ink I use that is nearly opaque – but too opaque for use with making digital negatives. Negatives require a very narrow dynamic range. Photogravure positives are even more narrow. If your heart is set on making outstanding backlits – you should contact us for this special Piezography Ultra Warm Opaque black ink. You can use a Warm Neutral ink set with this for a natural effect, or the Selenium ink set with this for a shadow split tone effect. For negative and positive printing for wet- processes, a curve must be applied to the image before printing in order to reduce or restrict or manipulate the dynamic range. While this can be sorted with a simple Photoshop curve and 2. Precision Digital Negatives that can make this task simpler called the Curve Calculator II Tonal Palette. The rest of their process is more oriented towards using color inks. So any similarity between PDN and Piezography digital film ends with the target. But a read through of their materials can be helpful in explaining why a curve in Photoshop is necessary. Piezography inks do not need to be made to block UV light using color pigments, but rather act as conventional silver negatives which are continuous tone negatives that simply block light by varying the opacity. Piezography prints without the dots and digital artifacts of the EPSON K3 inks and can produce significantly higher levels of resolution if the input file is greater than an optical resolution of 3. To help you wrap your head around what needs to be done on your part, here is a simple explanation in relation to darkroom principles. When you think of specular highlight and photographic negative film, you think of a density of perhaps 1. Light and logarithms and all that. This is going to result in a perfect representation of the step wedge and this is not ideal for darkroom process. But it is ideal as a base for your final digital negative files because of the vast increase in quality as compared to competing systems. You do not need to buy a digital file form PDN in order to do this. Quad. Tone RIP supplies a 2. Using the standard 2. QTR, making a Piezography digital film and printing it in some darkroom process might produce a print that looks like the below: The digital film exposed as silver print. The three points are to illustrate the desired d. Min, 5. 0% and d. Max. Remember that 1. These are “negatives”. The same process is reversed in figuring out a film positive for processes such as photogravure. By simple analysis, it appears that 6. All of the density from 6. So we need to take 1. So we need to transform 5. All of the nuances in the 1- 4% range are lost. So we need to take 0% gray (pure black) and move it to 5% as this will become our pure black once it is printed in silver. Anything lighter than this will now print with some detail. Now lets see it in terms that are more visual including the Photoshop exercise. Now you can see why the need to calibrate your process in Photoshop. If one creates a curve to restrict the input data to the points found by making test strips from a 2. It is a requisite part of this process that is unique to every type of wet- process and is affected by your own chemistry habits or techniques. How one makes the curve is to determine the three points and make a compensation in Photoshop curves. You would use the previously silver printed test strip from the Piezography digital film. But, it is only an example of a curve and it does not mean you do not have to go through the process yourself! So, this Photoshop curve applied to the digital step wedge image file that is used to make a silver print would convert it to something like this : The three points are now where we want them. Many photographers will use densitometry and apply 1. Photoshop curve to perfect things. But, silver is not linear, so 1/4 tones and 3/4 tones are probably a requisite. It is not much more difficult to determine 1/8ths. Just keep in mind, that your wet- process must be standardized before starting. You are calibrating your wet- process. If this Photoshop curves process may seem to you like something that should be built- in to Piezography digital film, it can’t. Everyone’s darkroom process is so different and often very personally arrived at. Each chemistry/paper combination will have a unique compensation. What Piezography digital film offers is a very smooth output process onto the film free of dots, artifacts, and a possibility of realizing far greater resolution of detail than that obtained by using Epson K3 color inks to make a digital negative. It’s a perfect base. Once the curve is obtained for Photoshop and provided you keep your darkroom chemistry standardized, it will be easy to create a workflow something like this: 1) The original digital file in Photoshop. Inverting the digital file into a negative in Photoshop. Applying the Photoshop calibration curve prior to printing with Piezography digital film. QTR using the curve “New. S9a. NG2b- Pictorico. UPohp. quad” onto Pictorico Ultra OHP film. Dry the film with a hair dryer or allow to set overnight. Differences from “normal” K7. The Piezography digital film system can not be used for printing regular Piezography prints because the two altered shades of ink will produce posterizations with conventional K7 curves. It is possible in all of the supported printers to have an extra shade 2 and shade 4 carts with the “normal” shade dilutions. You would need to perform two power cleanings (maybe 3) to get this ink to the print heads in the Pro 4. The desktop 2. 40. This ink set could then be used in combination with Piezography Gloss Optimizer to make regular glossy Piezography prints. By also changing out MPS shade 1 to K7 shade 1 matte black, the system could be used to make regular Piezography matte prints.
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