Resizing Pictures in Photoshop

For the pur­pose of the Sem­i­nar, we need to reduce the size of images for faster load­ing. One of the main issues is related to backgrounds.

Using a back­ground photo can be a real chal­lenge. Here below is an example.

To start with I choose a dig­i­tal pic­ture of (this is a mobile phone image and I have not mod­i­fied it ).

Astir Beach

The above image (for the pur­pose of this post) has been down-sized and re-sampled from 3072 px width to 1000 px and from a doc size of over 15 M to 1.6 M. It’s still heavy with 452 kb at 100% jpg.

[download_box]Down­load the orig­i­nal 3072x2304 px image 2mb[/download_box]

Down­load the image, decom­press it and open it in Photoshop.

You see now an image of 3072 x 2304 px.

We have mul­ti­ple ways to reduce the size and weight of the image. There are two aspects to resizing:

1. The resiz­ing of the image (pixels)

and

2. the resiz­ing of the document.

Our goal is to end up with a doc­u­ment of about 100 kb and a max­i­mum of image quality.

Resiz­ing the image means that we inter­vene on the num­ber of pix­els per square inch, resize the doc­u­ment means that we inter­vene on the dimen­sions of the image.

We aim to opti­mize the rela­tion between the num­ber of pix­els per square inch and the size of the doc­u­ment to obtain the best pos­si­ble full screen view in Semi­oman­tics Evolution.

Image size

Mod­i­fy­ing the Pixel Dimen­sions (tick: Resam­ple Image) will lead to:

Resam­ple Image

Note the res­o­lu­tion remains the same.

If I want to increase the res­o­lu­tion, I need to decrease the Doc­u­ment size, with­out resam­pling the image:

Increase Res­o­lu­tion

Com­pare the above with the first PS screen above: I have cut the Doc­u­ment size to 50% and kept the Pixel Dimen­sions: this dou­bles the Res­o­lu­tion (num­ber of pix­els per inch).

The above is the base to under­stand­ing Pho­to­shop and the way Pho­to­shop deals with images, whether we import them from a cam­era or pro­duce them in Photoshop.

Back to our image: The image has 16:9 proportions.

The above demon­strates the exam­ple men­tioned at yes­ter­days call about apple and straw­ber­ries: you can either fill an inch with fewer but big­ger pix­els or with more of them but smaller ones (resolution).

When resiz­ing the above image, you will find that the qual­ity finds it’s lim­its where the gra­di­ent of the blue color of the sky starts break­ing. This has to do with the resolution.

Prac­ti­cally speak­ing for a quick result:

Save the orig­i­nal image for Web and Devices and push the Qual­ity slider to the left till the gra­di­ent of the sky breaks (that’s just one tick too much). Then resize the image at bot­tom left by decreas­ing the width until the JPEG size is about 100 kb.

Save

You can see the final result on the site HERE.

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Related posts:

1. Web Design Work­shop 17 Resiz­ing Large Back­ground Image
2. Book cov­ers and Jewel Cases with Photoshop
3. Cre­ate a Fav­i­con with Photoshop
4. Pho­to­shop Ycademy
5. Pho­to­shop Bor­ders Ycademy

Tags: Build your Flash Website, Resizing Images in Photoshop

This entry was posted on March 24, 2010 at 8:42 pm and is filed under Design, Digital Photography, Photoshop, Semiomantics Evolution, Web Design, Ycademy, Yorgo Nestoridis. You can follow any responses to this entry through the RSS 2.0 feed.