What is resolution?
Resolution is what we use to describe the number of pixels that one image contains. If one image has higher resolution, that means the number of pixels to create the image image is quite large.
What resolutions are appropriate for print and for web?
The appropriate resolution for commercial print is 300dpi. In the other hand, for web the resolution is 72dpi.
How does resolution affect our ability to scale or edit an image?
The more pixels an image contains the more detail and quality it can contain, so if we have one image with higher resolution and want to make it smaller, it won’t be any problem because the resolution won’t be affected. On the contrary, if we have one image with lower resolution and want to make it bigger, the number of pixels will expand and the image will be too “blocky” and “pixellated”.
What file formats are most appropriate for Printing? Why?
EPS and TIFF formats are the most appropriate for print, because the preview of an EPS file is necessary to display the image in a page layout application, and the high-resolution portions of the file are necessary for imaging to a particular output device. The TIFF format is a raster-based file that supports RGB, CMYK, Grayscale, Lab, and Indexed colour, and so perfect for printing. For high-end print production, it is the best practice to use either LZW compression or a very small amount of JPEG compression.
What file formats are most appropriate for Web? Why?
The best format for Web is the JPEG format, since heroically compresses the data to be very much smaller in the file. However JPG uses lossy compression to accomplish this feat, which is a strong downside. A smaller file, yes, there is nothing like JPG for small, but this is at the cost of image quality. Also, the JPEG format supports 24-bits images or up to 16 million colours through the RGB, CMYK, and grayscale colour spaces.
What file formats are most appropriate for editing in Photoshop in the future? Why?
Since we already used the JPEG and PSD in class, in the future, the most appropriate format for editing in Photoshop might be TIFF, since we will probably need to print the documents and this is the best format for it. Besides, is one of the few file types that support all of Photoshop’s features and is another great choice for archiving your images, with lossless compression that allows to save photos with the highest possible image quality. Even though TIFF files are capable of storing all of the layers, adjustment layers and other elements we will add in Photoshop, it’s generally recommended that to save all those elements in our master PSD file and then use the TIFF format to save a flattened version of the image for print.
Explain CMYK and RGB, what are they used for and why?
CMYK Color Mode (subtractive): This is a four color mode that utilizes the colors cyan, magenta, yellow and black in various amounts to create all of the necessary colors when printing images. It is a subtractive process, which means that each additional unique color means more light is removed, or absorbed, to create colors. When the first three colors are added together, the result is not pure black, but rather a very dark brown. The K color, or black, is used to completely remove light from the printed picture, which is why the eye perceives the color as black.
RGB Color Mode (additive): RGB is the color scheme that is associated with electronic displays, such as CRT, LCD monitors, digital cameras and scanners. It is an additive type of color mode, that combines the primary colors, red, green and blue, in various degrees to create a variety of different colors. When all three of the colors are combined and displayed to their full extent, the result is a pure white. When all three colors are combined to the lowest degree, or value, the result is black. Software such as photo editing programs use the RGB color mode because it offers the widest range of colors.
Before, to achieve color, each ink (cyan, magenta, yellow, and black) had its own plate. First the printer would lay down one color, wait for it to dry, lay down another color, wait for it to dry and so on. Printing presses still work on that same theory to this day with the exception that offset printers can use a “spot” color which can be added to achieve a specific color swatch (usually a Pantone color). As the printing age has progressed, the digital printer has come a long way, allowing to print in RGB as well. But the standard still stays the same – use CMYK on all printing needs, as the color will appear differently if printed in RGB.
On the other hand, computer monitors give off colored light known as RGB (CMYK is colored ink.). This is because monitors are limited on the color spectrum range that they can produce due to the cathode ray tubes. Computer monitors have a larger color gamut than printing that can be achieved, which is why a computer can display a million more colors than what can be achieved with printing. Printing deals with absorption and reflection of wavelengths of which we perceive as color (CMYK). Printing also has its own limited color gamut. Sometimes people will note that something looked different on screen than it does on paper and it is because of the different limited color ranges that computer monitors and printing allows.
Explain Duo Tone and Grey Scale. What might these colour modes be appropriate for?
In Photoshop, Duo Tone are grayscale images printed with two, three, and four inks. In these images, colored inks, rather than different shades of gray, are used to reproduce tinted grays. A Duo Tone takes a monochrome grayscale image and allows to take the tonal range, from lightest tones to darkest, and allocate a different colour to specific part of the tonal range. These colour modes might be appropriate for make the highlights red and the shadows green, for example.
Which tools did you like the best and which ones did you find hard to use?
I really enjoyed working with the Retouching Tool because it is surprising how a tool can make such a difference when editing an image and transform it into something dissimilar to the original one. On the other hand, and despite had enjoyed working with this Tool too,I found the Quick Selection Tool not so easy to use just because it is very precise and requires some extra concentration.