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I took this photograph of the audience at the seminar on 13 Feb 2001. Then I downloaded the image. I had previously created a PowerPoint presentation. I made 9 identical copies of that presentation so that I could compare the effects of putting in different types of images by different methods. |
| PowerPoint file - original file size | 9 KB |
| Image - original file size | 558 KB |
| Operation | Image file size | PowerPoint file size | |
| 1 | No image processing, copy and paste image into PowerPoint | 558 KB | too big - wouldn't import |
| 2 | No image processing, Insert picture from file into PowerPoint | 558 KB | 597 KB |
| 3 | Crop. Save as tiff. Copy and paste | 4170 KB | too big - wouldn't import |
| 4 | Use the cropped tiff from (3), but Insert picture from file | 4170 KB | 1983 KB |
| 5 | Resize cropped image from (3) by 25%. Save as tiff. Copy and paste. | 265 KB | 598 KB |
| 6 | Use resized tiff from (5), but Insert picture from file | 265 KB | 179 KB |
| 7 | Use image from (5), save as jpg. Insert picture from file | 22 KB | 57 KB |
| 8 | Use image from (5), save as jpg, greater compression. | 17 KB | 52 KB |
| 9 | Use image from (5), change mode to indexed colour, save as gif. | 50 KB | 82 KB |
Hints
Adobe PhotoShop:
| To trim off the bits of the image you don't want: |
Image Crop |
| To scale or re-size your image: |
Image Image size check "Resample image" box |
| If you want to save as a gif, you need to make sure it's an 8 bit, Indexed colour image. To save as a jpeg, it should be an RBG colour image. |
Image Mode RGB color or indexed color |