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How to enlarge images in Photoshop
SIGNS: Understanding ColourOutput to PDFHow to use CorelDraw
Glossary of CorelDraw Terms P1P2Photoshop Tips and Tricks
Scanning ImagesPrinting Big Images

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Topics
Understanding
Colour

Output files
to PDF

Of Interest
Printing BIG images

CorelDraw
How to use CorelDraw
Combine Objects
Break Apart
Duplicate Objects
Artistic Text
Right Click &
Double Click Tools

Tools your should Learn
Things to avoid

Select all objects
Tips for Moving objects exactly
Duplicating objects
Shifting your origin the smart way

Drawing in
WireFrame or Enhanced View

PRE-Flight Printing
Printing Settings
Perfect Circles
Rich Black Printing
General Tips Corel
Glossary of Terms

Page 1, Page 2

PhotoShop
How to use Photoshop

Photoshop Tricks
EyeDropper Tool
Accidental Save
Paste images where you want
Ruler Settings

Jpegs as PSD
Sharpen edges
Measure Tool

Why color's don't match
Color numbers
Viewing Color

Size and Resolution
Print Resolution
File Sizes

Images or
Vector Graphics

The Magic Wand
Using Two Windows
The Grabber Tool
Get more Undo's
The Move Tool

Enlarging Images
Adding Noise

Dust & Scratches
Use Median Filter
TIP for Big images

Rename Layers
Cropping to size
Specific Sizing

Using a Scanner
Scanning Tips
How to resample
Scanning Images


 

 

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How to use Photoshop to enlarge images. Improving Jpeg Images
 
Enlarging images and photos in Photoshop


It's very common that one has to use an image for printing taken from a small size or from a jpeg. These images are usually small in size and you can clearly spot the jpeg compression in form of small squares. If you wanted to use such an image for printing, you can either use them in only very small size or the above mentioned squares will be visible. Obviously it's better to avoid using low res jpeg images for printing, but sometimes we can't avoid it. With the following procedure you can enlarge and improve your image slightly, so that it becomes printable. It can never be sharp and detailed, but at least it will not be jagged.

Once we enlarge it to its double size the problems of the jpeg compression will become obvious showing signs of pixilation.

The Fix:

First enlarge your it's double size with Image/Image Size. Make sure the Resample image option is selected and it is set to Bicubic. The small squares resulting from the jpeg compression are very much evident.

Second step to clear the jagged pixels around the edges apply Filter/Noise/Despeckle. This makes the image softer.

Now enlarge the image to it's double again and apply Filter/Stylize/Diffuse with the Anisotropic option. This will smoothen the edges further and it enhances the edges of the image. The reason we have to enlarge the image before applying this filter is that this filter is extremely evident at 100% and would destroy the reality of the image. At this size you can see that this filter works as if a human would go over the image with a brush and repaint it, improving the edges and getting rid of inconsistencies.

Next reduce the image back by 50% and apply Filter/Sharpen/Unsharp mask with the options Amount 60%, Radius 2 px, Threshold 2 levels. You can experiment with these options depending on your image.

NOTE: THIS FIX IS ONLY A GUIDE, BETTER TO SEND GREAT QUALITY IMAGES OR... use HI RES SCANS FROM YOUR PHOTOS.

TIP: TAKE DIGITAL PHOTOS AT MAXIMUM RESOLUTION
TIP: ALWAYS START BIG

Image Enlargement Tip Add Noise

Sometimes you need to enlarge images to extreme big sizes and you just can't get hold of any original that would have more details for your print. There is only one more important thing you can do, besides the things I've already discussed: add noise.

In PhotoShop go to Filter/Noise/Add Noise. Try the different settings for different visuals. The benefits are much more evident in print and in big size.

Also see our article with further methods to enlarge images for printing using more filter methods.

 

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