Ensure that all the boxes (scale styles, constrain proportions and
resample image) are ticked. Select bicubic sharper as the algorithm
for downsampling the image. If you need to make images bigger for
printing, I would recommend Bicubic smoother as the method of choice.
In the Document Size box, I have changed the resolution from the
original 300 ppi - which is fine for printing, but wasted on e.mails
as screen resolution is only 72ppi. So change the resolution to 72
ppi. Ignore the width and height measurements in the Document Size
Now go to the Pixel Dimensions box and change the longest dimension
of the image (the width or height depending on whether the image is
in landscape or portrait format ). For an image that will appear at
a reasonable size on the recipient's screen select a width or height
of between 600 and 800 pixels, depending on how big you would like
it to appear. (remember the smaller you make it, the quicker it will
As you set one dimension, say the width, notice how the height changes
accordingly to maintain the correct proportions (aspect ratio) so
the image does not become stretched or squashed.
In the example above, if you look at the pixel dimensions (in blue
text) you will notice that the filesize has now dropped from 24.9
Mb to 1.71 Mb , a good improvement, but still not good enough. The
next thing to be done is to compress it into a small jpeg using the
Click File > Save for web
If you select the "2 up" you will see your original image
on the left and a compressed "optimised " image on the right.
Ensure that jpeg is selected and click on the arrow by the Quality
box. A slider then appears. If you slide the quality slider, you will
alter the file size and as the size reduces, you will start to notice
compression artifacts developing , as you increase it, quality improves.
Your aim is to produce an image which looks pretty much the same as
the original, but only occupies about 30-60 Kb of space.
Once you are satisfied with your image, click "Save" and
save it to a folder of your choice. When you want to insert it into
an E.mail you can attach it or embed it from this location.