Luminous Landscape Forum
Raw & Post Processing, Printing => Digital Image Processing => Topic started by: once2work on August 26, 2007, 10:33:15 pm
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Hope someone can teach me about how-to up-sizing the file for large output inkjet printing. I'm shooting with the Canon 400D for wedding, some photo need to enlarge to 30 x 20 inkjet output, for the file size it is not enough data for such a big print, for instance, 300dpi only can go up 10 x 12 print, is any way or any software that can up-sizing the file without lost of detail as well the sharpness of the print. thank you........Paul Fan
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Genuine Fractals (http://www.ononesoftware.com/detail.php?prodLine_id=2) is a popular choice, as is Fred Miranda software (http://www.fredmiranda.com/shopping/SImpro).
Good luck!
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See: The Art of the Up Rez (http://www.digitalphotopro.com/tech/the-art-of-the-up-res.html)
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Hope someone can teach me about how-to up-sizing the file for large output inkjet printing.
[{POST_SNAPBACK}][/a] (http://index.php?act=findpost&pid=135703\")
Also try "Uprezzing Digital Images" by Jack Flesher
[a href=\"http://www.outbackphoto.com/workflow/wf_60/essay.html]http://www.outbackphoto.com/workflow/wf_60/essay.html[/url]
Used to make 17 x 24 inch prints from a Canon D20 and printed on an ipf 5000 with good results.
Jim
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If you're printing it yourself, it's hard to do better than Qimage (http://www.ddisoftware.com/qimage/). If you're sending it out to a lab for enlargement, it's often just as well if not better to let them do it.
If you don't care for either of those solutions, the upsampling routines in the latest (CS2/3) versions of PS are as good as any third party app I'm aware of, and Jack Flesher's approach offers a nice refinement to them.
Nill
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www.toulme.net (http://www.toulme.net)
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PhotoResampling (http://www.photoresampling.com/index_eng.php)
Don't forget to downoal PriterData and read DPI/PPI article.
After that you can understand why "300 DPI is an urban legend".
Jacopo
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See: The Art of the Up Rez (http://www.digitalphotopro.com/tech/the-art-of-the-up-res.html)
[a href=\"index.php?act=findpost&pid=135706\"][{POST_SNAPBACK}][/a]
Jeff,
I watched your video tutorial on the print and read the article linked above. I am particularly interested in improving my large-print skills. It would help clarify matters if the figures in your article were available in a form that was readable on video monitor. Can you help us?
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Hello jbrembat,
Can you please explain your comment about 300 DPI being an urban legend?
Thank you
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Hello jbrembat,
Can you please explain your comment about 300 DPI being an urban legend?
Thank you
[{POST_SNAPBACK}][/a] (http://index.php?act=findpost&pid=135779\")
Ok.
When you see a print, you see DPI (Dot Per Inch), not PPI (Pixel Per Inch).
Depending on printing technology DPI value can be equal to PPI value or larger than PPI value.
DPI=PPI for contone printers (1 pixel= 1 dot).
DPI>>PPI for inkjet printers (1 pixel -> many dots).
Every printer driver works at fixed PPI and fixed DPI values.
To understand driver think it is a black box.
The input to this box is PPI, the output is DPI.
The driver scan the image pixels and for each one do the job.
The scan (raster operation) is performed picking up a number of pixels equal to the PPI value to lay down one inch of print.
The only way to change the PPI/DPI value is to set the quality of printing. Or, if you can print borderless, the PPI value is slightly changed too
So as you have a weak control of PPI/DPI, between prefixed values, you CANNOT print at any resolution tou like.
The printer output resolutions are fixed by the producer.
The only thing you can do is to give the right PPI value to the driver.
If you don't, the driver wil resample your image (Nearest Neighbour is the standard fast way).
Now, every discussion about what resolution the human visual system can discern doesn't make any sense. The printer producer fixed the DPI value (you can know it as it is in the printer specifications).
Moreover you can find that, after justifying 300 or 240 DPI, by eyes resolution power, people transform the DPI value into PPI value.
BIG MISTAKE.
For inkjet printers PPI value is different from DPI value. Do you know dithering or halftonig or error diffusion?
If you have a printer connected to Windows (or can run a windows application), go to [a href=\"http://www.photoresampling.com/index_eng.php]PhotoResampling[/url], download PrinterData and you will be able to know your printer PPI and printable area.
Jacopo
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Hope someone can teach me about how-to up-sizing the file for large output inkjet printing. I'm shooting with the Canon 400D for wedding, some photo need to enlarge to 30 x 20 inkjet output, for the file size it is not enough data for such a big print, for instance, 300dpi only can go up 10 x 12 print, is any way or any software that can up-sizing the file without lost of detail as well the sharpness of the print. thank you........Paul Fan
[{POST_SNAPBACK}][/a] (http://index.php?act=findpost&pid=135703\")
I too am interested in this topic. I have purchased and watched the LL video "Camera-to-Print." In this video and in this thread Jeff Schewe offers guidance on how to process files to make large prints. He referred to his article "Art of the uprez [a href=\"http://www.digitalphotopro.com/tech/the-art-of-the-up-res.html"]http://www.digitalphotopro.com/tech/the-ar...-res.html"[/url] which contains some useful details about the process. Some of the needed information is shown in figures contained in the article but unfortunately I have been unable to read the details in the figures, probably because they were prepared for a print magazine article. Although I have tried to PM Jeff for this info, I have not yet received an answer. One of the captions
"ABOVE: These screenshots show the process by which Schewe interpolated the 6-megapixel image up to 16 megapixels via the Bicubic Smoother option"
shows several little screen shots from PS. Can anyone provide the details?
Is there some way to get this information or display the link mentioned above so the figures become legible?