it is best to save the advertising map made by p>PS in lossless TIF format.

JPG will lose some picture quality, which is definitely not desirable for high-quality printed matter. In addition, the resolution is greater than 3dpi and the color mode is CMYK. Poster advertisement is an image printed in TIF format. Although the file is large, the printed poster is more realistic.

and the color mode of the picture must be cmyk, otherwise there will be more serious color difference. This is because the poster printing machine is cmyk four-color printing.

when a designer submits a document for printing a poster, it is best to click on the image to see if the image mode is cmyk and save it as PSD.

the resolution requirement of poster printing factory is 3 pixels/inch for small posters and 8 pixels/inch for large posters.

Common file storage formats: 1. If the file needs to be modified later, save it in psd format.

psd format files can keep all layers, masks, channels, paths, non-rasterized text, layer styles, etc. in the document.

2. If the file only needs to be viewed later, it can be saved in jpg format.

3. If the file is set to be transparent, it needs to be used on a web page or flash and saved in png format.

4. if the file moves in time, save it in GIF format.

TIFF has become a popular high-bit color image format together with JPEG and PNG.

TIFF format is widely supported in the field of image processing, such as AdobePhotoshop, JascGIMP, UleadPhotoImpact and PaintShopPro.

desktop printing and page layout applications, such as QuarkXPress and AdobeInDesign, support scanning, fax, word processing, optical character recognition and other applications in this format. Adobe acquired the PageMaker printing application from Aldus and has been controlling the TIFF specification since 214.

the term "TaggedImageFileFormat" or "TagImageFileFormat" existed as a subtitle in some early TIFF specifications. In 214, TIFF specification TIFF6. no longer uses these terms, but is called "TIFF".

TIFF file format is suitable for file exchange between application programs and computer platforms, which makes the exchange of image data easy.

first of all, when drawing with ps, first make clear a goal, that is, to print, photo-shoot, print or spray-paint. This is the premise of drawing with bitmap software.

whenever printed matter is finalized with customers, the color mode is preferably CMYK mode, because there is color difference between the drawing in the computer and the actual finished product, and the minimum color difference of CMYK mode is 1%.

photo: 72dpi, printing: 3dpi, inkjet: 3dpi, if you want to make a large picture of dozens of square meters, you can achieve 2dpi.