[Photoshop] Images side by side

  1. Open the first image, go to Image/Image Size and note its Width and Height
  2. Open the second image, go to Image/Image Size and note its Width and Height
  3. Repeat for the N-th image
  4. If images are to be stacked vertically:
    1. Resize all images to have the same Width (or crop them)
    2. Create a new image (CTRL-N), enter its Height as the sum of the Heights, and its Width as the common Width
  5. If images are to be stacked horizontally:
    1. Resize all images to have the same Height (or crop them)
    2. Create a new image (CTRL-N), enter its Width as the sum of the Widths, and its Height as the common Height
  6. Paste/Open/Drag the first image and position it with the Move Tool
  7. Add a new layer (CTRL-Shift-N)
  8. Paste the second image or drag&drop it, then position it with the Move Tool
  9. Repeat for the N-th image
  10. Press Return when done.
Annunci

[Photoshop] Change image resolution (dpi)

  1. Open the image in Photoshop
  2. Go to Image/Image Size
  3. Uncheck “Resample Image”
  4. Enter the desired dpi in the “Resolution” box, where dpi are expressed in pixels/inch

Screenshots are usually between 72 and 100 dpi, while for proper printing images should be at 200-300 dpi

[Photoshop] Crop to pixel dimensions

  1. Create a new image (CTRL-N) of the exact pixel size
  2. Add a new layer (CTRL-Shift-N)
  3. Paste the image od drag&drop it.
  4. Position it with the Move Tool
  5. Resize the pasted image while holding Shift to maintain the aspect ratio
  6. Press Return when done.

source: http://boards.straightdope.com/sdmb/showthread.php?t=389139