![]() ![]() Pay attention to the publisher’s requirements for compression and whether your software compresses by default. Be aware that different compression methods can affect image quality. JPG) compress the pixels in the image to reduce file size. Always keep original files and ensure that the re-sampling process only happens towards the end of the figure creation process, so that you can go back to the original image if needed. However, re-sampling may sometimes be necessary for example, when converting a very high-resolution image to a small size (2 x 2 inches). As a general rule, create your images at the highest resolution possible to avoid the need to re-sample. This could be particularly important if you are presenting images that are taken from a microscope it is imperative that re-sampling does not change the specific features of the data within the micrograph. ![]() Because re-sampling adds or removes pixels, a loss of image quality could result. Down-sampling removes pixels and creates a smaller image, whereas up-sampling adds pixels using algorithms. Re-sampling changes the number of pixels in an image. Whatever image size you require, ensure the final version is at the desired resolution. The larger image will look OK on the screen, but the image quality will be poor if it is printed. For example, if you re-size a 1200 x 750 pixel image from 4 x 2.5 inches to a 12 x 7.5 inches the number of pixels will remain the same but the resolution will drop from 300ppi to 100ppi. When re-sizing an image, some software programmes automatically change the size of the image without changing the number of pixels. For more information on image resolution, and another way to check if the resolution of your image is appropriate, see. You can also quickly check whether the resolution is sufficient by zooming your image to 400% and if it is blurry (pixelated), then the image may not reproduce well when printed. If you have fewer pixels, then the quality of the image (i.e. A photo that will be 4 x 2.5 inches when printed will need at least 1200 x 750 pixels to achieve the desired print-quality resolution of 300 ppi. If your image needs to be 300ppi, then you need to consider the size of your image in the final printed form and the number of pixels in your total image. When submitting figures for publication, 300 ppi is the generally accepted resolution for print images. To view an image on the accepted resolution is 72ppi as most LCD monitors display 67-130ppi. The terms are used interchangeably but for most purposes, ppi and dpi are essentially the same thing to describe resolution. The resolution of an image for viewing on a monitor is described in ppi, whereas the term dots per inch (dpi)describes the resolution of a printed image, as printers print dots and not pixels. Some software (such as Photoshop) allows you to change the units to pixels per centimetre however, the publishing standard is usually ppi. In general, the more pixels you have per unit area, the more detailed the image will be and the larger the file size. An image that has a resolution of 300ppi and is 4 x 2.5 inches in size, will be 1200 pixels wide (4 x 300) = and 750 pixels high (2.5 x 300). 1200 pixels wide by 750 pixels high) or as the number of pixels within a specified area ( pixels per inch or ppi). Resolution can be expressed as the number of pixels per dimension (e.g. A pixel is the smallest unit of digital information that forms an image. Resolution describes the number of pixels within an image and image quality increases with resolution. Before preparing figures for the web or for print, it is vital to ensure that the appropriate resolution is used. Common examples include TIFF, JPEG and EPS. How to ensure your photos, graphs and illustrations are of suitable quality for publicationĭigital images are stored in different formats, depending upon the software. ![]()
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