Best way to save .png image?

T
Posted By
troy
Oct 24, 2003
Views
1370
Replies
2
Status
Closed
Greetings All,

I am creating a series of .png images for use in a PowerPoint presentation (.png for images with transparency and .jpg for the others). I am using PhotoShop 7 and have been using the SAVE FOR WEB option. They images are working just fine, but I have received some suggestions to save them in various ways, so here are my questions:

1. Is a .png image always 72 dpi or can it maintain the 96 dpi (windows screen resolution) I set the image to?

2. What is the difference between SAVE AS and choosing .png and the SAVE FOR WEB?

Thank you for the insights.

Troy Chollar
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XT
xalinai_Two
Oct 25, 2003
On Fri, 24 Oct 2003 13:55:58 -0700, "Troy @ TLC Creative" wrote:

Greetings All,

I am creating a series of .png images for use in a PowerPoint presentation (.png for images with transparency and .jpg for the others). I am using PhotoShop 7 and have been using the SAVE FOR WEB option. They images are working just fine, but I have received some suggestions to save them in various ways, so here are my questions:

1. Is a .png image always 72 dpi or can it maintain the 96 dpi (windows screen resolution) I set the image to?

PNG stores DPI settings. But DPI is no relevant information for on screen use of images.

DPI for monitors includes ranges from a 21" screen used in VGA mode (38 DPI) to a 10" Panatek monitor displaying 1024×768 (256 DPI).

Use DPI where it belongs to: To specify the default print size.

Michael
T
tacitr
Oct 25, 2003
1. Is a .png image always 72 dpi or can it maintain the 96 dpi (windows
screen resolution) I set the image to?

When you are showing something on a computer monitor, it is very important to understand that resolution means *nothing.* Nothing at all. The only thing that matters is the *size in pixels.*

An image that is 300 pixels by 200 pixels at 72 pixels per inch will look absolutely identical to an image that is 300 pixels by 200 pixels at 96 pixels per inch, which will look identical to an image that is 300 pixels by 200 pixels at 1,000,000 pixels per inch on a screen. It is only when you *print* the image that the resolution matters.

2. What is the difference between SAVE AS and choosing .png and the SAVE FOR WEB?

Save for Web allows you to see the effects of different compression settings interactively, and saves the image without icons, previews, color profiles, or other metadata that will increase the size of the file.


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