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Images for Print

Participant ,
Feb 27, 2017 Feb 27, 2017

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I need to prepare images for print.

When changing to 300 DPI,

Do I deselect Resample?

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correct answers 1 Correct answer

Participant , Feb 27, 2017 Feb 27, 2017

Thanks everyone for the immense help. More questions coming your way soon.

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Community Expert ,
Feb 27, 2017 Feb 27, 2017

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Yes, if you want to enlarge the image, but beware it will soften the image as it does this my sampling adjacent pixels. If you have a large image then leave it unticked and it will increase the resolution and reduce the image dimensions.

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Participant ,
Feb 27, 2017 Feb 27, 2017

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it is for billboard..to be enlarged from 10 to 100%

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Community Expert ,
Feb 27, 2017 Feb 27, 2017

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If it's for a large poster that's to be viewed from a distance it doesn't need to be 300ppi, it can be much lower, say even 20ppi. Maybe your printer is suggesting 300ppi because they intend to enlarge it themselves (and therefore reduce the ppi).

I suggest you have another chat with your printer to clarify.

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Participant ,
Feb 27, 2017 Feb 27, 2017

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Good, yeah, talked to them, they said 300 ppi + keep resample on. My file is now 200plus MB @ 300ppi

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Community Expert ,
Feb 27, 2017 Feb 27, 2017

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As a matter of interest, what are the dimensions on your original image (in pixels) and what are the dimensions of the poster (in inches or cm)?

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Participant ,
Feb 27, 2017 Feb 27, 2017

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2000 x 1900 px

the other 3500 x 2950 px

Final poster full scale: 1200 x 300 cm

Designing at 10%

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Community Expert ,
Feb 27, 2017 Feb 27, 2017

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Perhaps someone can check my arithmetic, but I calculate that the Photoshop image would be something like 142000 x 35,000px giving a file size if 5Gb!

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Participant ,
Feb 27, 2017 Feb 27, 2017

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I don't think i need it that big, or am i wrong? 5 GB????? Thats humongous. Are u sure?

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Community Expert ,
Feb 27, 2017 Feb 27, 2017

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1200 x 300 cm = 472x 118 inches

472 x 300 = 141600

118 x 300 = 35400

141600 x 34400 = 5012640000

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Community Expert ,
Feb 27, 2017 Feb 27, 2017

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Derek is absolutely right - you need to talk to your printer again.

It's actually slightly worse in terms of file size. Derek's calculation is the pixel size 5Gpx - given that each pixel is 3 bytes for RGB (or 4 if CMYK) that gives an uncompressed file size of 14GB (19GB for CMYK) !

Unless this billboard is meant to be viewed from a few inches away you do not need 300ppi.

Dave

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Community Expert ,
Feb 27, 2017 Feb 27, 2017

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Or even better, get a new printer!

By the way, keep your file in the RGB color mode

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Participant ,
Feb 27, 2017 Feb 27, 2017

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Why RGB?

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Community Expert ,
Feb 27, 2017 Feb 27, 2017

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You work in RGB so as to have the highest gamet (range of colors) and the flexibility to repurpose the image for whatever purpose. Also in some workflows its best that say an inkjet's printer's software does the conversion from RGB to CMYK or even to CMYK+.

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Community Expert ,
Feb 27, 2017 Feb 27, 2017

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It does happen that you talk to people who don't have a clue - they just "heard" that you need 300 ppi for print. But they have no idea what it actually means.

300 ppi for a billboard is a misunderstanding, period, and you can just disregard that.

For large-scale reproduction like this, involving photos, you take the ppi you get. You have that many pixels to spread over that many inches, so that's the ppi (pixels per inch) you end up with. That said, 2000 pixels won't get you far, and I would never try to use such a low-res image for anything full-scale, whether a book spread or a banner/billboard. I wouldn't be comfortable with anything below 5000 or 6000.

I don't see why you should need to work at any percentage. Photoshop can do this at full size, 1:1. It works with pixels anyway, not dimensions.

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Participant ,
Feb 27, 2017 Feb 27, 2017

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Pls do mention if 300 ppi u mean effective

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Community Expert ,
Feb 27, 2017 Feb 27, 2017

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The actual resolution is what exists in the image file before any scaling is applied. The effective resolution is the resulting PPI after scaling is applied.

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Participant ,
Feb 27, 2017 Feb 27, 2017

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Thanks everyone for the immense help. More questions coming your way soon.

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New Here ,
Feb 09, 2022 Feb 09, 2022

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I'm trying to download my pictures so I'll be able to print them

 

 

 

 

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Community Expert ,
Feb 10, 2022 Feb 10, 2022

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LATEST

arthur22886373ytrn

tell us more please? what are you attempting? and how?

 

I hope this helps
neil barstow, colourmanagement net :: adobe forum volunteer:: Co-Author:Getting Colour Right
google me "neil barstow colourmanagement" for lots of free articles on colour management

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