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Author Topic: Large Format Printing Qimage Reduces Resolution  (Read 6097 times)
SevenSuns
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« on: November 12, 2020, 10:19:07 PM »

I regularly print 10 feet long.  When I open those large images, Qimage is reducing the size from 24" x 120" to 21.8" x 109.22".  Why is that happening?
When I place the image on the center panel, and make it fit the page, which is the size I imported, Qimage says that it will print at 200 ppi.  That is unacceptable.  I need it to print at the original size and resolution, or I have customers asking for refunds.  Please tell me how to fix this.
Thanks!
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admin
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« Reply #1 on: November 13, 2020, 12:51:14 AM »

What is the printable area of the page (size of the page listed above the live view)?  If you are printing on a 24 inch roll, maybe 21.8" is the printable width unless you activate borderless mode.  And what is the resolution of the image you are printing?

Regards,
Mike
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SevenSuns
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« Reply #2 on: November 13, 2020, 01:17:35 AM »

What is the printable area of the page (size of the page listed above the live view)?  If you are printing on a 24 inch roll, maybe 21.8" is the printable width unless you activate borderless mode.  And what is the resolution of the image you are printing?

24 x 120 is the printable area.  I always print borderless.  I import a 24 x 120 300 dpi image.  But, when it lands in the left panel, and I put my mouse over it, it indicates the file is 200 dpi, not the 300 dpi of the original file.
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SevenSuns
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« Reply #3 on: November 13, 2020, 01:18:37 AM »

Just so you know, I print other sizes, like 96" or 48".  They are imported at the correct resolution of 300 dpi.
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« Reply #4 on: November 13, 2020, 01:40:51 AM »

I would really need to see the screen to be able to see what you are doing.  If you can post a screen shot of the main window showing the full window with your mouse over the image in question, I could see what is going on along with all settings.  If it's too big for the forum, you can post a link to the image if you like.  Qimage doesn't "import" anything: it simply looks at files.  So if it is reporting 200 PPI, either that image file is set to 200 PPI or the "override" option is being used on the "Original Size" print size.  In any case, Qimage will use the full resolution of the image regardless of the embedded PPI.  The embedded PPI is there only to set the "preferred" print size.  So if you chose 24x120 as the print size (and you have enough printable area on the page to print that size), it will use all of the image's resolution and will upsample to your printer's PPI (typically 600 or 720 PPI).

Regards,
Mike
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Fred A
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« Reply #5 on: November 13, 2020, 04:01:13 PM »

Just to clarify for Mike's request from you, he would like to see the live view screen including the information at the top showing printable area with and without borderless. He also wants to see the little white tag that pops open when you hover the mouse over the image in live view.
Just trying to help.
See the numbers at the top of Live view? That is the printable area my driver allows on 13 x 19 paper Normal print.
The lower shot is borderless. See the numbers change?
He also wants the resolution of the image.

Fred
« Last Edit: November 13, 2020, 04:04:04 PM by Fred A » Logged
SevenSuns
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« Reply #6 on: November 13, 2020, 09:35:41 PM »

I did a short screen capture, https://youtu.be/MpsiDw0UX9Q

Here is the resolution of the image... https://ibb.co/HBQmzY3
« Last Edit: November 13, 2020, 09:42:49 PM by SevenSuns » Logged
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« Reply #7 on: November 14, 2020, 03:02:59 AM »

Thanks.  The screen capture showed me the story.  Your driver is runnning at 200 PPI.  Some of the Canon drivers reduce resolution when you switch to a large size.  You'll need to go into the driver and:

(1) Click the Layout tab at the top
(2) Click the "Special Settings" button on the bottom of that Layout tab
(3) Click on "FineZoom Settings" and switch it to "No"

This will prevent the driver from trying to "dumb down" the resolution by requesting a lower PPI just because you are trying to print a large size.

Regards,
Mike
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SevenSuns
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« Reply #8 on: November 14, 2020, 05:14:44 AM »

You are a hero!  Thank you very much!
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