Photoshop I

I450 Technology Seminar

Adobe

Photoshop Illustrator Acrobat InDesign ImageReady

This seminar Resolution intro Layers Tools

Marquee Paint Brush Move

feather Magic Wand Clone Stamp Paint Bucket Gradient

New Image File -> New Set width, height and resolution

Leave resolution at 72 pixels/inch unless you need an image with a high resolution

Mode RGB (red, green, blue – use for color images) Grayscale (use for black and white)

Contents White is you want a blank white image Background Color if you want the same color as

background Transparent

Modes

Bitmap: uses black and white color values to represent the image.

Grayscale: up to 256 shades of gray

RGB: red, green and blue dots CMYK: cyan, magenta, yellow and

black to create printed colors

Resolution The number of pixels on the screen 640 x 480 800 x 600

800 pixels across, 600 pixels tall Standard for 15” monitors

1024 x 768 What happens if you create an image at

800 x 600, and then reset the screen size to 1024 x 768?

Resolution

800 x 600 = 480,000 pixels 1024 x 768 = 786,432 pixels 1280 x 1024 = 1,310,720 pixels

The pixels on an 800 x 600 screen are smaller than the pixels on a 1024 x 768 screen

Resolution 1-by-1-inch image with a resolution

of 72 ppi contains a total of 5184 pixels (72 pixels wide x 72 pixels high = 5184). File size=16K

The same 1-by-1-inch image with a resolution of 300 ppi contains a total of 90,000 pixels. File size=264K

Resolution Bitmaps are resolution dependent Difficult to increase or decrease their size without

sacrificing a degree of image quality Reduce the size of a bitmap image through your

software's resample or resize command, you throw away pixels

Increase the size of a bitmap image through your software's resample or resize command, the software has to create new pixels

Creating new pixels, the software must estimate the color values of the new pixels based on the surrounding pixels. This process is called interpolation.

Scaling vs. Resizing

Zooming is scaling Does not effect the image

permanently Does NOT change the number of

pixels in an image Resizing an image does change

the image permanently

Resolution

On the web 72 ppi is good For print 72 ppi may be too low

300 ppi for print Can move from high resolution to low Don’t try to move from low resolution

to high Keep resolution in mind when

creating images in Photoshop!

Samples

Program Files > Adobe > Photoshop 7.0 > Samples

Open ducky.tif, dune.tif eagle.psd, and flower.psd

.psd files are Photoshop Files Contain all the layer and formatting

information Very large files

File Browser

Upper right part of screen

Easy way to open files

Navigator

Move the focus of the picture

Zoom in and out

To zoom in press Crtl and the + button, to zoom out press Crtl and -

LayersCreate layers of images on top of each other. This is one of the real strengths of Photoshop.

View or hide layer

Layer name and details

Layers

Minimize everything but the eagle and the flower

With the Move Tool (top row, right), drag the eagle on top of the flower

You’ve just created an layer (eagle) on top of the flower layer.

HistoryMove backwards all the way to the NEW state of your document

Create new document from current state

Create new snapshot

Delete current state

Tools

There are many tools in Photoshop. Under the Window menu you can hide and unhide the ‘toolbox’.

Marquee (selection) Tool

Allows you to make selections. Selections can be used for moving, filling, etc.

You can always select the Inverse of what you’ve selected by going to Select in the Menu bar and selecting Inverse, after you’ve made a selection

Move Tool

Allow you to move things that you have selected.

Just select and drag

Magic Wand

Selects a group at once.

Fill ToolUsed to fill a selection with a color or a pattern

Create a selection with the rectangular marquee tool,Select the fill tool, and fill that selection with a color

Fill with Patterns

In the options bar of the Fill tool, select Pattern from the dropdown menu

Select a pattern in the next drop down menu

Fill a selection with a pattern

Adding options

This triangle will open the dialog box

Select Load Patterns

Load new patterns

This is the same for LoadingShapes, and Gradients

Cropping Cropping lets you

‘set’ an image. After you’ve

selected the part of the image you want cropped, press Enter =

Brightness and Contrast

In the menu bar go to: Image -> Adjustments -> Brightness

and Contrast Adjust the brightness and contrast

of an image Brightens and darkens the entire

image Very little tonal control

Layer Mask

When you have two layers, go to: Layers -> Add Layer Mask ->Reveal

All Use the paint brush and erase tools to

reveal and hide the layers

Filters

In the menu bar there are a lot of Filters you can apply to your images

Custom Shapes Many useful

shapes are predefined in Photoshop

You can load shapes by pressing this button and selecting:

Load Shapes

Gradients

Gradients

Allow you to make colorful images Good to use for backgrounds You can load gradients the same

way you load custom shapes