Tiff: Color or grayscale photos (halftone): Always use a minimum of 300dpi. Tiff: bitmap line drawing: use the lowest 1000 dpi. The first point is that the dpi of gray-scale images is at least 300 dpi, such as pathological images and electrophoretic images. The second point is that the resolution of dot matrix linear graphics is generally above 1000dpi, such as curves or histograms drawn by excel and structural formulas drawn by chemdraw. Problems encountered in submission: The dpi of general digital photos is 72, while the dpi of pictures made by excel is 200, which cannot meet the submission requirements. Therefore, it is necessary to change the dpi settings. Solution: Create a new A4 format picture in photoshop, and select the resolution required by the magazine in the picture size option (for example, 1000ppi, which may involve a concept of ppi and dpi. Actually, you don't need to worry about it. Simply put, one is equivalent to the output of a computer screen (ppi) and the other is equivalent to the output of a printer (dpi). As long as the ppi is set to 1000, the printing resolution will be 1000dpi, which is numerically equivalent). Paste excel or photos directly into the newly created layer (note that the displayed picture may be small), enlarge the picture to a size suitable for viewing, and cut the required area. If the magazine requires the picture size, you can set the picture size option (for example, 5cm*3cm), save it in tiff format, remove the check mark before saving the layer, and confirm, then use LZW to compress and confirm. The advantage of saving the picture in this way is about 200k dpi: Usually we paste the picture made by excel into word or save it directly as a picture, and we will find that the picture will shrink in the early Qing Dynasty, but it will be blurred after enlargement, and the dpi will increase. Although reducing the picture feels not as good as directly saving it in the early Qing dynasty, the image is still very clear after you enlarge it many times. If the original picture is a curve made by the "origin", perform black and white line art (simple bar graph, chart, etc.) according to the requirements of "1200 dpi (dots per inch)". ) ",the modification process is as follows: (1) Open the graphic program" Origin "(such as Origin Pro 7.5); (2) Click the file ""to export the page ... and select the tag image file (*. Tif) in the save type. At the same time, check the box before displaying the image option to confirm the saving. (3) In the TIFF options window, "DIP" is set to1200; "Color depth" selects monochrome; Select LZW to "compress", and finally click "OK". (4) Open the obtained TIF format picture with Photoshop, and confirm that the resolution is 1200 pixels/inch and the width is about 6000 pixels in the menu image and image size; Click "OK". (5) Select "TIFF" and "Save" as "File" and "Format"; Select "LZW" in "Image Compression"; Click "OK"; You can get pictures that meet the requirements of magazines! If the picture is a JPG photo, such as an electron microscope photo, 300 dpi is used for halftone (black-and-white photo) and 600 dpi is used for combining halftone (photo that also contains artistic lines, such as labels or thin lines), the following processing is performed according to any of the above requirements: (1) Open the picture in Photoshop, and select grayscale (for black-and-white picture) or CMYK (for color picture) in the image mode menu (2) Set the resolution to. (3) Select the file, save as and format as TIFF and save it; Select "LZW" in "Image Compression"; Click "OK"; You can get pictures that meet the requirements of magazines!