Ex 3 - Primary Colours

Exercise 3 – Colour Theory 1

1.     Start Photoshop and create a new document with the following properties :- ·       Name : ‘Ex 3 – Primary Colours’ ·       Size : A4 @ 300dpi ·       Colour Mode : RGB / 8 bpc ·       Background Colour : White 2.     What is the keyboard shortcut for creating a new Document ?  Command “N” 3.     What is the size of the image in :- §  Megapixels -            10.8        Megabytes  1.1 4.     Set the foreground colour to Red (ie R 255, G 0, B 0). 5.     Select the Ellipse Tool (not the Marquee tool). What is the keyboard shortcut :-    “M”       6.     Draw a circle with the Ellipse tool approximately 6cm in diameter (about 1/3rd of the page width) – display the rulers and use Preferences to set the units to cm . ·       Which key forces the ellipse to be a circle ?           shift        7.     Change the layer name to ‘Red Circle’. 8.     Duplicate the layer and ·       change the colour to green and ·       change the name to ‘Green Circle’.          Note: To change the colour click on the colour button on the option bar immediately after duplicating the layer, or double click on the layer in the Layers palette. 9.     Duplicate this layer and ·       change the colour to blue and ·       change the name to ‘Blue Circle’. 10.  Select the Move tool. What is the keyboard shortcut ?   “V”         11.  Turn on the ‘Auto-select’ option. 12.  Spread the three circles across the top of the page with a small space above them (they may overlap a bit – that’s OK). 13.  Fit the image to the screen (ie so the whole page is visible). ·       What is the keyboard shortcut for this ?       Command ”0” 14.  Go to Full Screen Mode – ‘View -> Screen Mode ->Full Screen Mode’. ·       What is the keyboard shortcut ?    "F" 15.  Stare at the centre of the middle circle for 20 seconds, then look at the white area below. You will see an after image. ·       What colour are the after images for each circle ? Circle After Image Colour Red blue Green yellow Blue red 16.  Select all three layers in the layers palette. 17.  Group the three layers together by selecting ‘Layer -> Group’. ·       What is the keyboard shortcut ?     command “G” 18.  Select the group in the layers palette containing the three circles. 19.  Change the ‘Blending Mode’ for the group from ‘Pass Through’ to ‘Difference’. (We will be looking at Blending Modes later, so don’t worry if you don’t understand them now). 20.  Stare at the centre of the middle circle for 20 seconds, then look at the white area below. You will see an after image. ·       What colour are the after images for each circle ? Circle After Image Colour Cyan magenta Magenta yellow Yellow cyan 21.  Save the document as ‘Ex 3 – Colour Theory.psd’ 22.  What is the size of the .psd file on disk ?      more then twice the size      How does this compare to the image size you recorded in step 3 above.