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#1
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(pixle per inch) ppi is only 72 HELP
hi i use paint shop pro quite often and have recently noticed the (pixel per inch) ppi is only 72 on every photo i have taken with my a80. anyone know why? is it the software reducing ppi? thanks Ian ------------ My Photo album http://public.fotki.com/hurst/ comments welcome |
#2
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The ppi (pixels per inch) is simply related to printing, it sets the size of
the print. It makes no difference to your image. When you print just set the size you want in page setup. "Ian Hurst (Troyka)" wrote in message ... hi i use paint shop pro quite often and have recently noticed the (pixel per inch) ppi is only 72 on every photo i have taken with my a80. anyone know why? is it the software reducing ppi? thanks Ian ------------ My Photo album http://public.fotki.com/hurst/ comments welcome |
#3
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"Ian Hurst (Troyka)" wrote in message ... hi i use paint shop pro quite often and have recently noticed the (pixel per inch) ppi is only 72 on every photo i have taken with my a80. anyone know why? is it the software reducing ppi? 72 ppi is a computer screen standard (I think it is based on an early Macintosh). So, if you are sending pictures via email, 72 ppi is about all one needs. Unfortunately, this default confuses us as some software assumes it. Mostly, it can be ignored for other purposes such as printing, archiving, etc. |
#4
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hi i use paint shop pro quite often and have recently noticed the (pixel
per inch) ppi is only 72 on every photo i have taken with my a80. anyone know why? is it the software reducing ppi? ------ On the forum at Jasc for Photography and Scrapbook this Resolution topic for printing often occurs. The following is a response by a Jasc representative Kris K. The person posting was asking about sizing his image in order to take it to a printing service to get a 4 * 6 result. RESOLUTION If in PSP you do Image Resize and change the resolution ("Resample Using" unchecked) the resolution value is changed the normal image data and also in the EXIF header if present. If you don't want the number of pixels in the image to change,please 'don't check' - "Resample Using"- option. When this option is 'not checked' you change only the' resolution'. As you change the resolution the size of the image in physical units is modified to reflect the new resolution but the size in pixels does not change. When you open an image into PSP for editing it is not in 'any' format. The image is a device independent bitmap. When you change the image and save it you choose the format in which you wish it to be saved. If you choose a lossless compression format such as PSP, TIFF or PNG there will be no JPEG compression. If you choose the JPEG format the image will be compressed as if it were being created for the first time. PSP has no way to know if the image you are saving was, for instance, opened and then filled with completely new data or opened and changed in a minor way. Consequently all saving is done as if you were dealing with a newly created image. ----------- PaintShoPro.Photography newsgroup is available via server userforums.jasc.com and digital images are accepted. This forum is available at the jasc.com site also Rose |
#5
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hi i use paint shop pro quite often and have recently noticed the
(pixel per inch) ppi is only 72 on every photo i have taken with my a80. anyone know why? is it the software reducing ppi? The image from the camera does not have any 'ppi' at all. It is simply a 2000 x 3000 or whatever pixel count the camera sensor delivers. It is a dimensionless collection of pixels. However, when the image is opened in a graphics program, in order to display the image, the program will use a default ppi. It is the graphics program which does this, and not a feature of the image itself. If your graphics program has an image size function, you can alter the ppi *without* resampling, whereupon the image size changes. F'rinstance, if your program defaults to 72 ppi, and the image size is 2000 x 3000 pixels, the apparent size on the screen will 2000/72 x 3000/72 inches, that's 27 x 42 inches approx. Which is why you can't see the whole picture at once. If you tell the program to display the image at, say, 600 ppi, the image will then be about 3 x 5 inches *on the screen*. The image itself hasn't been changed at all, only the pixel display pitch has changed. The same goes for printing. Specify a size for printing, and the image delivered to the printer will be at such a ppi as will give the required size. NOTE none of the foregoing has resampled the image. If you want to send a picture over the net, at a given size, say, 5 x 7, at 72 ppi, then you will have to resample, that is, change the pixel count so that the image at 72ppi will produce a 5 x 7 image on screen. Now, a 5 x 7 image at 72ppi will be 5*72 * 7*72 pixels, that is, 504 x 360 pixels, which is an image of 181,440 pixels (far smaller than the 6 million pixels in the original image. Inevitably, you lose information when you do this, so don't do it to your original image!!), and a Jpeg file with about a 10:1 compression will be about 18 kilobytes, a suitable size for sending over the net. Hope this helps, Colin |
#6
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The ppi (pixels per inch) is simply related to printing, it sets the size of
the print. It makes no difference to your image. When you print just set the size you want in page setup. "Ian Hurst (Troyka)" wrote in message ... hi i use paint shop pro quite often and have recently noticed the (pixel per inch) ppi is only 72 on every photo i have taken with my a80. anyone know why? is it the software reducing ppi? thanks Ian ------------ My Photo album http://public.fotki.com/hurst/ comments welcome |
#7
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hi i use paint shop pro quite often and have recently noticed the
(pixel per inch) ppi is only 72 on every photo i have taken with my a80. anyone know why? is it the software reducing ppi? The image from the camera does not have any 'ppi' at all. It is simply a 2000 x 3000 or whatever pixel count the camera sensor delivers. It is a dimensionless collection of pixels. However, when the image is opened in a graphics program, in order to display the image, the program will use a default ppi. It is the graphics program which does this, and not a feature of the image itself. If your graphics program has an image size function, you can alter the ppi *without* resampling, whereupon the image size changes. F'rinstance, if your program defaults to 72 ppi, and the image size is 2000 x 3000 pixels, the apparent size on the screen will 2000/72 x 3000/72 inches, that's 27 x 42 inches approx. Which is why you can't see the whole picture at once. If you tell the program to display the image at, say, 600 ppi, the image will then be about 3 x 5 inches *on the screen*. The image itself hasn't been changed at all, only the pixel display pitch has changed. The same goes for printing. Specify a size for printing, and the image delivered to the printer will be at such a ppi as will give the required size. NOTE none of the foregoing has resampled the image. If you want to send a picture over the net, at a given size, say, 5 x 7, at 72 ppi, then you will have to resample, that is, change the pixel count so that the image at 72ppi will produce a 5 x 7 image on screen. Now, a 5 x 7 image at 72ppi will be 5*72 * 7*72 pixels, that is, 504 x 360 pixels, which is an image of 181,440 pixels (far smaller than the 6 million pixels in the original image. Inevitably, you lose information when you do this, so don't do it to your original image!!), and a Jpeg file with about a 10:1 compression will be about 18 kilobytes, a suitable size for sending over the net. Hope this helps, Colin |
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