Resolution_color_printing

8/3/2019 Resolution_color_printing

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Resolution, Color Management& Printing


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Resolution


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Digital Cameras

Digital cameras measure the image size not in pixels per inch but instead, its

measured in megapixels. A megapixel is simply 1 million pixels.

To find out how many megapixels youneed to create a particular image size,

in Photoshops image size dialog box

you set the resolution you want and the

image size you want.

Multiply the number of pixels together.In the example to the left you would

need a camera that had 6.5 megapixels

-

(2179 x 3000 = 6,537,000)


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300 pixels per inch (ppi)



1 inch

1 inch

1 inch

Resolution simply

means how large a

pixel is when you print

it , and it usually is

measured in pixels per

inch.

More pixels per inch

means higher

resolution.

Print Resolution


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How high of a resolution do you need?

That will depend on what medium your image is viewed in such as monitors,

printers, scanners, digital cameras. Unfortunately, there can be confusion becausethe terminology for different devices can vary (ppi, dpi, lpi, megapixels,

and so on.) Sometimes we use lines per inch because dots arent used to make up

the image such as in half tones used in newspaper work.

Some Common lpi Settings:

85 lpi Newspaper Advertisements

100 lpi Newspaper Editorial section

133 lpi Magazines and brochures

150 lpi High-end magazines and high quality brochures175 lpi Annual reports and high end brochures

53 lpi 300 dpi Laser printers




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Youll get very high quality results on most injet printers if you

use images with resolution settings between 240 and 360 ppi.Anything over 360 is just overkill.

You probably wont even notice the difference between 360 ppi

and one with a higher resolution even if you use a magnifying

glass to compare them.

If you work with textured papers you might want to use closer

to 240 ppi and if you use a glossy paper you might want to use

360 ppi. My general recommendation is to to split the

difference and use 300 ppi if you are unsure.


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Resampling

Resampling will change how large the pixels are that make up the image. Anychanges you make to the resolution setting when the resample box is checked will

make the pixels larger or smaller, but the image will stay the same overall size.

This might be useful if you have a high resolution image going to a low resolution

medium. By making that change the file size would become less and that can be

very useful in many different ways. Lowering file sizes for the purposes of the webwill allow images to load faster in a browser and in printing it will lessen the

time it takes to print.

Caution is advised however as once the image is resampled to a lower resolution

you will not be able to resize it back to a larger size since you threw away pixelsto get the image smaller. Trying to make it bigger will result in a pixelated image.


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Notice in this example that is notresampled. By changing the

Resolution you change the size of

the image but the number of pixels

stays the same.

Digital cameras frequently give a

default setting of 72 ppi but the

image is quite large. If you change

the resolution to around 300 ppi the

image size will be quite a bit smaller(typically 4 x6 inches.)


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Sharpening the Image

The last thing youll do before sending your image to its final destination may be to sharpen the

image. Most images NEED sharpening. However, its important to understand what that means. You

will go to the Filter section under the menu bar to find the Sharpen commands. You do not use

Sharpen...you will use Unsharp Mask. Oddly named, its is a remnant from techniques used in theprinting industry in the past.

Unsharp mask puts a halo around each pixel to make

it appear sharper. If it is done in the correct proportion it

will improve the appearance of the image. If it is

overdone it will be apparent and lessen image quality.Different mediums will require different levels of

sharpening.

There are 3 settings in the Unsharp Mask dialog box.

Amount, Radius and Threshold. The Amount is

measured in percent and you can go above 100%

without harm to the image. Radius refers to the howmuch space will be used for the contrast boost between

pixels and the setting should probably should not

exceed 1.5 pixels. Threshold determines how different

two colors have to be for sharpening to kick in.

Threshold set at 0 will sharpen everything. You should

view your image at 100% size while sharpening.


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Color Management & Printing


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How do you make a print that looks the same as it does on the monitor?

Through color management.


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The big problem with color is trying to get everyone to agree what color a

color actually is....Buy three Red felt tip markers from three different

manufacturers and see if they all look the same. Walk into a store to look at

different televisions from different manufacturers and see if the pictures alllook the same.

In order to get accurate color throughout the process, all of the devices used

must be profiled so that they know how one another interprets color.

All of the monitors in this lab have been profiled using a sophisticated

calibration device & software. You should calibrate your monitors at home if

you intend to work there and expect half way accurate color here.

All of the printers used here have had all of the papers commonly used hereprofiled with the same sophisticated device and software used on the

monitors.

Doing these things is only the beginning.....

M k i i t d Th h t l b t h ld b t


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Make sure your image is tagged. The photo labs computers should be set

up to embed a profile of Adobe RGB 1998 automatically. In Photoshop you

can set that up under Edit > Color Settings


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Youll need to make sure that several dialog boxes all are in agreement about what kind of file you are

using, what kind of paper you are printing on and even what printer you are printing on. Whenever you are

printing you will want to start the process by clicking on the Print button under File in the menu bar.


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After you push the Print button youll see this dialogue box.

Check to make sure that all of these boxes are set as below. One exception is the

Printer Profile setting....it should state the Type of paper your are using..

You will change this to a Paper Profile!

Clicking on the Printer Profile tab brings up a large number of choices You need to select the


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Clicking on the Printer Profile tab brings up a large number of choices. You need to select the

one that matches the specific paper your are using. If you dont...your picture will not be color correct.

The paper & Ink types are listed using a code...Enhanced Matte Paper = EMP

Premium Luster Paper = PLP, Photo Black ink = PK, Mate Black ink = MK etc.


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Click on the page set up button to be sure that your printer is selected,

the right size paper is selected and that the image is properly oriented on

the paper.


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When you push the Print button youll be given yet another dialog

box where you must check a couple of other things. The first is to

check the Print Settings

The Print Settings dialog box looks like this You should make sure that the


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The Print Settings dialog box looks like this. You should make sure that the

Media Type agrees with the paper you are using, that the ink is set to color if

you are making a color print and that the Mode is set to the Advanced settings

with Print Quality at Superfine 1440.


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You will need to back track to where you saw Copies & Pages and

go down to Printer Color Management


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You will see a box that allows you to make color adjustments. But

you dont want to use them!

Si ki l dj t t ithi Ph t h d t t


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Since you are making your color adjustments within Photoshop you do not want

the printer to do anything other than what youve told it to do. You will click the

No Color Adjustment tab and then the Print button to start printing.

If you let Photoshop determine the color

turn this to OFF


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If you have followed all of the steps

mentioned previously you should endup with a print that looks very close to

what you see on screen. If your print

looks vastly different than what you

see on screen... chances are very good

that youve neglected to make all of

the proper settings agree with one

another. You should double check tomake sure that you have selected all of

the proper settings.

Resolution_color_printing

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