ImageMagick is widely used in industries such as web development, graphic design, and video editing, as well as in scientific research, medical imaging, and astronomy. It can be used to create, edit, compose, or convert bitmap images, and supports a wide range of file formats, including JPEG, PNG, GIF, TIFF, and PDF. Consult your software's documentation for further details.ImageMagick ® is a free, open-source software suite, used for editing and manipulating digital images. JPEG and other bitmap images can be cropped using any photo or graphics editing package, typically by selecting the area of interest and then selecting the 'Crop' option from the menu. If possible, the work should be saved as a JPEG only at the end of any process of editing the figure. Such images are better submitted as TIFFs or PNGs.Īuthors should minimize the number of times an altered version of an image is saved as a JPEG, as every time a modified JPEG image is saved, there is some degradation of quality. JPEG is a poor choice for flat color images, line-art and screenshots as sharp edges create visible artefacts even at maximum quality settings. as the compression allows much higher resolution images to be submitted, for a given file size, with very little degradation of quality, provided the 'Maximum quality' setting is chosen. JPEG is a good choice for photographs, micrographs, autoradiographs etc. However, resaving low quality JPEG images with higher quality settings is not advisable, as it will only increase the file size without improving the qualityof the image See graphic below for a comparison of quality settings.Ĭourtesy of Bates et al., BMC Developmental Biology 2006, 6:33 In order to maintain as much image quality as possible, JPEG files should be saved at Maximum quality. JPEG is a 'lossy' bitmap format - in order to maintain a small file size, some information in the image is discarded. JPEG - Joint Photographic Experts Group Back to top Then, from the File pull-down menu, select Page Setup and change the dimensions of the slide to match that of the image. Select all the elements in the slide and the cut these elements. To crop a PPT file, open the View pull-down menu, ensure that the Ruler option is selected, and measure the dimensions of the image. Ensure that all embedded artwork is at a suitable resolution (approximately 300 dpi, when scaled to the anticipated size of the figure in the final PDF). PPT files should be directly uploaded to the site, rather than converted to JPEG or another format that may be of reduced quality. The slide title or number should not be included. There should be no background colour unless it is strictly necessary for the figure. Powerpoint is another good option for submitting figures containing both vector and bitmap elements, for authors who do not have access to a specialized drawing package.įigures must be a single slide. However, rasterization will typically increase file size and reduce quality, compared with a vector image. If there are problems cropping the PDF image then, as a last resort, consider rasterizing it (converting from vector to bitmap format) using Photoshop, cropping the bitmap (again using Photoshop) and submitting the resulting bitmap image in TIFF or JPEG format. Here the cropping boundaries are set by selecting a handle at a corner of the cropping rectangle, and dragging it to the correct size. Change the page margins by using the up and down arrow keys for each margin (left, right, top, bottom).Īlternatively, cropping can be done by selecting the crop tool from the toolbar. Select Crop Pages from the Document menu. PDF files can easily be cropped using the full version of Adobe Acrobat. PDF version 1.4).Īuthors should ensure that PDF figures are not password protected as this prevents BMC working with the figure and can render such figures incompatible with earlier versions of Adobe Acrobat. PDF files should be compatible with Acrobat 5.0 onwards (i.e. This means ensuring that all artwork within the PDF is at a suitable resolution (300 dpi or more, at the intended final size of the figure) and that any non-standard fonts are embedded. Whether using Adobe Acrobat Distiller or other tools for PDF creation, authors should choose the appropriate options to create high resolution PDFs suitable for print use. To ensure hiqh quality, it is vital to choose the right settings when creating PDFs. PDF is an excellent, modern image format, which can contain both vector and bitmap elements. PDF - Portable Document Format Back to top
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