Looking at Layers

During this lesson we look more closely as the layer option in Adobe Photoshop.

This lesson included:

  • looking at applying blending modes to layers
  • Rearranging layers to change the stacking order in when working with an image
  • Create layers
  • Saving a file with all layer combined

This is what we created during this lesson which looks pretty effect and fairly professional.

Bitmap Images and Vectoring

We also learned more about Bitmap images as well as Vectorising

Bitmap:

  • Photoshop images creates Raster images which are composed of pixels.
  • Disadvantages are as soon as you enlarge or print at a higher resolution, the pixels lose their definition, this is known as pixellation.
  • The images are resolution dependant.
  • If the image resolution is less than the output device resolution, Photoshop will interpolate extra pixels to compensate, but this always leads to loss of quality.  If the image resolution is greater than the output resolution, Photoshop must ‘downsample’

These are types of image formates

GIF / JPEG / TIFF / BMP / DIB / PCD / PNG…

  • The main differences between these file formats lie in the compression technique of each file.
  • JPEG works on discarding pixels

Vector:

  • Also known as drawing programmes because they were used for good technical drawing such as maps and graphs
  • Illustrator is a good example of such a programme
  • The images are made of vectors which are mathematical descriptions
  • Images are resolution independent.

These are types of Vector graphic formats

Adobe Illustrator (.ai) / Corel Draw (.cdr) / Flash (.fla / .swf).

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