Today we practiced using text in Photoshop.
Friday, January 29, 2010
Monday, January 25, 2010
Resolution, File Size and File Formats
One of the less glamorous topics we'll cover but necessary to understand.
File Formats:
jpg = great for photographs, allows for compression
gif = great for graphics and animations, allows optimized palettes
png = Used for online but less than previously, allows for compression
bmp = format started by Microsoft, used on their machines
RESOLUTION:
72 dpi for computer and television screens
150 dpi for newsprint
300 + dpi for printing on coated glossy paper
Usually the larger the file size, the larger the pixel dimensions.
Two jpgs both with 72 dpi and same quality of compression but with a different pixel dimension ... The larger one will have a bigger file size.
Two jpgs both 72 dpi with the SAME pixel dimension but a different file size...one is more compressed with a lower quality than the larger sized file.
You can easily make a high dpi (300) image smaller in resolution by changing the dpi to 72 if it will be on the internet. The image size can remain the same or made larger. The extra dpi can be exchanged to a larger dimension.
However an image with 72 dpi cannot be made to be 300 dpi unless you reduce the final document size by changing back the pixel dimensions to what they had been prior to stretching it from 72 to 300 dpi.
WHY IS RESOLUTION IMPORTANT?
For images to be clear when you print them, they have to have a high enough dpi. Stretching images are a bad idea because it causes pixelization and blurring. This is very important to avoid for items to be printed.
For images to be small enough to download quickly in a browser, they need to be compressed in a file format compatible with browsers.
QUALITY OF IMAGE AND FILE SIZE ARE LINKED TOGETHER.
When one rises so does the other.
RESOLUTION (DPI) and SIZE ARE LIKE A TEETER TOTTER...A huge image can be shrunk down to be 300 dpi and still not lose any quality. A small image can be stretched larger as long as a high dpi is exchanged to a low dpi.
File Formats:
jpg = great for photographs, allows for compression
gif = great for graphics and animations, allows optimized palettes
png = Used for online but less than previously, allows for compression
bmp = format started by Microsoft, used on their machines
RESOLUTION:
72 dpi for computer and television screens
150 dpi for newsprint
300 + dpi for printing on coated glossy paper
Usually the larger the file size, the larger the pixel dimensions.
Two jpgs both with 72 dpi and same quality of compression but with a different pixel dimension ... The larger one will have a bigger file size.
Two jpgs both 72 dpi with the SAME pixel dimension but a different file size...one is more compressed with a lower quality than the larger sized file.
You can easily make a high dpi (300) image smaller in resolution by changing the dpi to 72 if it will be on the internet. The image size can remain the same or made larger. The extra dpi can be exchanged to a larger dimension.
However an image with 72 dpi cannot be made to be 300 dpi unless you reduce the final document size by changing back the pixel dimensions to what they had been prior to stretching it from 72 to 300 dpi.
WHY IS RESOLUTION IMPORTANT?
For images to be clear when you print them, they have to have a high enough dpi. Stretching images are a bad idea because it causes pixelization and blurring. This is very important to avoid for items to be printed.
For images to be small enough to download quickly in a browser, they need to be compressed in a file format compatible with browsers.
QUALITY OF IMAGE AND FILE SIZE ARE LINKED TOGETHER.
When one rises so does the other.
RESOLUTION (DPI) and SIZE ARE LIKE A TEETER TOTTER...A huge image can be shrunk down to be 300 dpi and still not lose any quality. A small image can be stretched larger as long as a high dpi is exchanged to a low dpi.
Friday, January 22, 2010
File Resolution and Blog Creation
Students signed up for their Capstone blog on blogger and pasted in their Statement of Intent from their digital file as their first post. Welcome to the bloggosphere!
Resolution of files:
72 dpi or ppi (dots/inch or pixels/inch) -> Computer monitors and Televisions
150 ppi -> print on newsprint
300 ppi or more -> print on coated stock (like photographic paper)
Size and resolution are related.
I can take a 72 ppi image and change it into a 300 ppi image in Photoshop if I change the Image/Image size from 72 to 300, click unlock proprotion and re-enter the initial pixel dimensions. Now the image will appear smaller when printed than it did on the screen, but the image will remain crisp and smooth. If I only stretched the image to 300 and did not readjust the pixel size to match the original dimensions, the final image would essentially be blown up 4.2 times. An image that is stretched up in pixel dimensions will look pixelated and blurry.
We will continue a discussion of resolution next week and do an image to place as the main image on student's capstone blog. We will also learn how to do cool things with TEXT in Photoshop.
Resolution of files:
72 dpi or ppi (dots/inch or pixels/inch) -> Computer monitors and Televisions
150 ppi -> print on newsprint
300 ppi or more -> print on coated stock (like photographic paper)
Size and resolution are related.
I can take a 72 ppi image and change it into a 300 ppi image in Photoshop if I change the Image/Image size from 72 to 300, click unlock proprotion and re-enter the initial pixel dimensions. Now the image will appear smaller when printed than it did on the screen, but the image will remain crisp and smooth. If I only stretched the image to 300 and did not readjust the pixel size to match the original dimensions, the final image would essentially be blown up 4.2 times. An image that is stretched up in pixel dimensions will look pixelated and blurry.
We will continue a discussion of resolution next week and do an image to place as the main image on student's capstone blog. We will also learn how to do cool things with TEXT in Photoshop.
Wednesday, January 20, 2010
Class Intro
Today students had a chance to share what media they are thinking of using for their capstone project.
They practiced downloading an image onto their computer harddrive and then uploaded it into their ftp account on the Multimedia server with Filezilla.
The syllabus was passed out and read over and students signed their acknowledgement that they understood the requirements of the class and gave permission for Richland College's Multimedia Department to use things they create to show other students or to promote the school. They agreed to attend class and complete work and notify the instructor when they are unable to attend class.
* HOMEWORK FOR FRIDAY - Create a description of your Capstone Project...the topic and the things you will need to do to create it in your medium/media of choice. This should be in digital format...because we will load them up in our blogs on Friday.
They practiced downloading an image onto their computer harddrive and then uploaded it into their ftp account on the Multimedia server with Filezilla.
The syllabus was passed out and read over and students signed their acknowledgement that they understood the requirements of the class and gave permission for Richland College's Multimedia Department to use things they create to show other students or to promote the school. They agreed to attend class and complete work and notify the instructor when they are unable to attend class.
* HOMEWORK FOR FRIDAY - Create a description of your Capstone Project...the topic and the things you will need to do to create it in your medium/media of choice. This should be in digital format...because we will load them up in our blogs on Friday.
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