Manipulating Images
Sunday, April 10, 2011
12th Week : Case Study 3
Here's the scenario - a print shop/graphics designer/magazine asks a client for a photo at 300 dpi. They wish to print it out 7" x 5". The client already has a beautiful digital photo with pixel dimension of 2048 x 1536. The client notices that the photo editing software is showing that the photo is set to 72 dpi. So, following orders, the client types in 300 to reset the dpi to 300. In doing so the image is resampled and is enlarged over 4 times to pixel dimensions of 8533 x 6400. The client sends this enlarged 300 dpi photo. The print shop/graphics designer/magazine rejects it (too grainy, too colour blotched). The client is crushed.
The sad thing is that the client already had the perfect photo (2048 x 1536 @ 72 dpi) which would have been beautifully printed at 7" x 5" ( at 292.6 PPI). The print shop / graphics designer /magazine didn't know what they really wanted. - READ WHAT PRINT SHOP REALLY WANT and the client didn't know how to change the DPI without resizing the image to give the print shop what they mistakenly think they need - READ HOW TO CHANGE THE DPI.
ANALYZE THE ABOVE PROBLEM. PREPARE YOUR REPORT IN YOUR BLOG ON UNDERSTANDING WHAT IS DPI?
Resolution dpi = (pixels of length) / (inches of length)
Resolution is the measurement of how many dots/pixels fit into one inch.
• The higher resolution, the sharper the image will be.
• Recommends resolution: 300 dpi (dots per inch)for crisp, clear results.
• Lower resolution images appear fuzzy, jagged and blurry.
• Enlarge an image, the resolution decreases;reduce an image,the resolution
increases.
DPI
•Dots per inch (dpi)
•Dots per inch (dpi) refers to printed dots and the space between them
PPI
•Pixels per inch (ppi)
•Pixels per inch (ppi) refers to the square pixels in a digital image.
•This will affect the print size and quality of your photo.
**Many companies will ask for images at 300dpi when they really mean 300ppi.
Resampling is the name for the process which figures out how best to subtract (or add) pixels when the number of pixels in the image is changed.
With resampling, the client change the 72ppi image to 300ppi. The pixel dimension of image is increased from 2048 pixels to 8533 pixels at the same time. This is not suitable for printing as 7” x 5” image.
DPI = 8533 pixel / 7"
= 1219
Increasing the pixels of image is a bad idea, because the created pixels are generated by the computer and the results aren’t usually that good. It's good to save the original large file. 1219 PPI for printing is too blotch for the image.
The client should unchecked the resampling box.
DPI = 2048 pixel / 7"
= 293
Without resampling, the pixels dimension of image is remained in same size which is already perfect photo. Thus, it doesn't effect the quality of image.
The sad thing is that the client already had the perfect photo (2048 x 1536 @ 72 dpi) which would have been beautifully printed at 7" x 5" ( at 292.6 PPI). The print shop / graphics designer /magazine didn't know what they really wanted. - READ WHAT PRINT SHOP REALLY WANT and the client didn't know how to change the DPI without resizing the image to give the print shop what they mistakenly think they need - READ HOW TO CHANGE THE DPI.
ANALYZE THE ABOVE PROBLEM. PREPARE YOUR REPORT IN YOUR BLOG ON UNDERSTANDING WHAT IS DPI?
Solution
Resolution dpi = (pixels of length) / (inches of length)
Resolution is the measurement of how many dots/pixels fit into one inch.
• The higher resolution, the sharper the image will be.
• Recommends resolution: 300 dpi (dots per inch)for crisp, clear results.
• Lower resolution images appear fuzzy, jagged and blurry.
• Enlarge an image, the resolution decreases;reduce an image,the resolution
increases.
DPI
•Dots per inch (dpi)
•Dots per inch (dpi) refers to printed dots and the space between them
PPI
•Pixels per inch (ppi)
•Pixels per inch (ppi) refers to the square pixels in a digital image.
•This will affect the print size and quality of your photo.
**Many companies will ask for images at 300dpi when they really mean 300ppi.
Resampling is the name for the process which figures out how best to subtract (or add) pixels when the number of pixels in the image is changed.
With resampling, the client change the 72ppi image to 300ppi. The pixel dimension of image is increased from 2048 pixels to 8533 pixels at the same time. This is not suitable for printing as 7” x 5” image.
DPI = 8533 pixel / 7"
= 1219
Increasing the pixels of image is a bad idea, because the created pixels are generated by the computer and the results aren’t usually that good. It's good to save the original large file. 1219 PPI for printing is too blotch for the image.
The client should unchecked the resampling box.
DPI = 2048 pixel / 7"
= 293
Without resampling, the pixels dimension of image is remained in same size which is already perfect photo. Thus, it doesn't effect the quality of image.
12th Week : The relationship between PPI and DPI
PPI: stands for Pixels per Inch. PPI describes the number of pixels per inch in a photo. PPI is a function of the number of pixels the camera's sensor supports (also known as megapixels) and the size of the photo. To calculate a photo's PPI simply multiply the page length by its width in inches. The result is the number of square inches on the page. Now divide the number of pixels the sensor supports by the number of square inches. The result is the number of pixels per square inch. All that is left to do is to find the square root of this number. Following is a table that shows the PPI for various page sizes for a 5 megapixel camera.
page size 4X6 – 456 PPI
page size 5X7 – 377 PPI
page size 8X10 – 250 PPI
page size 11X14 – 180 PPI
page size 16X20 – 125 PPI
page size 20X30 – 91 PPI
DPI: stands for Dots per Inch. DPI is really a physical characteristic of a printer. Every printer prints dots that when put next to each other comprise a photo. Each dot has a physical size. DPI is also known as the maximum resolution that a printer is capable of. Low-end printers have lower DPI while high-end printers have higher DPI. DPI is defined as the number of dots a printer can print per inch. For example if a printer supports 1200 DPI it means that the printer can print 1200 dots per inch (on both X or Y axis). When printing it is important to make sure that the DPI is higher or equal to the PPI. If the DPI is lower than the PPI the printer will not be able to fully display the high resolution of the photo. When printing a photo that has a lower PPI than DPI the printer will use multiple dots to represent one pixel. As opposed to PPI, DPI is not relative to the page size. DPI is a fixed number for a given printer.
From Link : http://www.streetdirectory.com/travel_guide/104309/photography/the_difference_between_dpi_and_ppi.html
page size 4X6 – 456 PPI
page size 5X7 – 377 PPI
page size 8X10 – 250 PPI
page size 11X14 – 180 PPI
page size 16X20 – 125 PPI
page size 20X30 – 91 PPI
DPI: stands for Dots per Inch. DPI is really a physical characteristic of a printer. Every printer prints dots that when put next to each other comprise a photo. Each dot has a physical size. DPI is also known as the maximum resolution that a printer is capable of. Low-end printers have lower DPI while high-end printers have higher DPI. DPI is defined as the number of dots a printer can print per inch. For example if a printer supports 1200 DPI it means that the printer can print 1200 dots per inch (on both X or Y axis). When printing it is important to make sure that the DPI is higher or equal to the PPI. If the DPI is lower than the PPI the printer will not be able to fully display the high resolution of the photo. When printing a photo that has a lower PPI than DPI the printer will use multiple dots to represent one pixel. As opposed to PPI, DPI is not relative to the page size. DPI is a fixed number for a given printer.
From Link : http://www.streetdirectory.com/travel_guide/104309/photography/the_difference_between_dpi_and_ppi.html
8th Week : Photography Composition
Photography Composition
1. Simplicity
There is a reason why simple is king. Cut the frills, cut the distractions, cut the clutter. The more objects you remove from the picture, the clearer and sharper your story and subject will be to the viewer.
2. Rule of third
One of the most crucial element of making great photographs is the composition and you can make good composition by following the rule of thirds. The rule of thirds in the photographic composition speaks about the placement of the subject in the third part of the frame — where the photographic plane is divided into three equal parts either vertically, horizontally or diagonally.
3. Framing
One of the easiest ways to take a creative photograph is to compose your subject with a frame around it. A photographic frame is an object that that acts as a border or frame for your subject. The frame directs the viewer’s attention to a particular subject or point of interest within the photograph. Frames also create perspective and show depth.
4. Balance
Good balance in photography requires the correct combination of colors, shapes, and areas of light and dark that complement each another. By looking at your subject and capture it from different viewpoints, angles or even at different lighting, you can composed a balanced image. Rearranging the elements can also make the wanted effect. And here is a simple tips, try to make a triangular shape from the elements you capture, this will create a sense of stability.
5. Line
Lines can be effective elements of composition, because they give structure to your photographs. Lines can unify composition by directing the viewer's eyes and attention to the main point of the picture or lead the eyes from one part of the picture to another. They can lead the eyes to infinity, divide the picture, and create patterns. Lines can lend a sense of depth to a photograph.
1. Simplicity
There is a reason why simple is king. Cut the frills, cut the distractions, cut the clutter. The more objects you remove from the picture, the clearer and sharper your story and subject will be to the viewer.
2. Rule of third
One of the most crucial element of making great photographs is the composition and you can make good composition by following the rule of thirds. The rule of thirds in the photographic composition speaks about the placement of the subject in the third part of the frame — where the photographic plane is divided into three equal parts either vertically, horizontally or diagonally.
3. Framing
One of the easiest ways to take a creative photograph is to compose your subject with a frame around it. A photographic frame is an object that that acts as a border or frame for your subject. The frame directs the viewer’s attention to a particular subject or point of interest within the photograph. Frames also create perspective and show depth.
4. Balance
Good balance in photography requires the correct combination of colors, shapes, and areas of light and dark that complement each another. By looking at your subject and capture it from different viewpoints, angles or even at different lighting, you can composed a balanced image. Rearranging the elements can also make the wanted effect. And here is a simple tips, try to make a triangular shape from the elements you capture, this will create a sense of stability.
5. Line
Lines can be effective elements of composition, because they give structure to your photographs. Lines can unify composition by directing the viewer's eyes and attention to the main point of the picture or lead the eyes from one part of the picture to another. They can lead the eyes to infinity, divide the picture, and create patterns. Lines can lend a sense of depth to a photograph.
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