Here you will find all of the information (appropriate links (including Dropbox folder links for homework), notes, reminders, etc.) for Anthony’s Photoshop 101 (Photoshop Basics for Artists)
NOTE: Please respect the work, rights, and privacy of participating artists. You may view the uploaded homework efforts from the class within the Dropbox folder, but you may not download or manipulate their work in any way. Anya and I will be downloading uploaded homework or classwork images when needed/appropriate, but we will never share anyone’s images outside of the class without express permission from the author. All files in the Drobox folders will be deleted at the end of the course. In addition, please know that classes will not be recorded to respect each participant’s learning experience.
If there are files required for the week’s homework, then they will be available in a folder called “WeekX_Resources” in the appropriate week’s folder. You will need to download to files in this folder to complete the week’s homework. However, please be sure not to remove or add anything to this folder.
Select fundamental concepts about digital images and related Photoshop image management.
The resources folder for this weel will contain one large example image file for personal homework use if you do not have a large file of your own. This will be addressed in class.
DROPBOX FOLDER LINK:
Today we discussed several fundamental aspects of digital imaging. We covered the pixel, the dot, ppi, dpi, resolution, image size, image quality (compression), file size, megapixel, megabyte, and file formats (psd, tiff, jpeg, png, gif, raw, cr2.)
Some definitions we used:
A pixel is a smallest possible element of a digital picture. A megapixel is 1 million pixels. A pixel is not necessarily a square, though for ease of use most photo imaging software suites will render them as such; it is more easily referenced to as a measurement of area.
This is the number of pixels in height and width across a screen or digital image. For example, an image with a resolution of 1024 x 768 would have 786,432 pixels or 0.8 megapixels (rounded up).
PPI (Pixels Per Inch)
Pixels per inch is the density of pixels over a 1 inch area. You can determine the PPI of a device by taking the resolution and dividing it by the physical width and height of the device. 300 PPI is generally the highest aimed-for density, as the human eye cannot tell the difference in image quality beyond that. Displays generally use subpixels of RGB color to generate actual pixels.
DPI (Dots Per Inch)
In terms of physical printed images, dots per inch is the density of individual ink dots that a printer is able to generate. In comparative terms to PPI, you can’t compare the two. DPI is for printed photos, and PPI is for digital displays. In terms of conversion from resolution, a printer can treat pixels as dots and in such case a higher DPI setting would result in higher quality but also in a smaller picture. Although a printer may say “Can Print up to 2400 DPI,” that doesn’t mean that you’ll actually ever print anything with that high of a density.
We also discussed two common ppi settings relative to our focus: 72ppi and 300ppi.
“In general, 300ppi at the original size is considered minimum to reproduce the photograph well at the size of the original.”— A passage from the Federal Agencies Digital Guidelines Initiative’s Technical Guidelines for Digitizing Cultural Heritage Materials.
Keep in mind how many of these concepts are tied together. One example given today was “a 1 megapixel image (approx. 1 million pixels) taken with a DSLR camera with a 2:3 aspect ratio would be 1200x900 pixels.”
HOMEWORK: Due in Dropbox by Oct. 12th
Scenario (please read carefully!!!): A popular gallery contacts you for a “high-res jpeg” image of one of your artworks for use in an upcoming feature in a magazine. In addition, they would like to add the image to their website. Their IT person is pretty busy as the moment and asked if you could make a second image ready for website upload. They request “a smaller version with a height ranging anywhere from 700 to 1000px.”
Please put the two files you would send to the gallery in this week’s Dropbox folder. Each “correct” file submitted in time is worth 1 point.