A poster is a simple and straightforward medium for advertising and marketing. But it can get pretty tricky to get right. When it comes to poster design, if you do too little, you won't be able to make it attractive enough. Meanwhile, if you do too much, you will end up overwhelming and discouraging your target audience and the message delivery won't be effective enough for a successful promotion attempt.  

Not only that, but you also have to make sure that the format of your poster design is compatible with high quality printing so that you can get the best poster possible.  

1. Color Processing 

There are two most popular color processing, namely the RGB and CMYK. RGB and CMYK color processings use different primary colors where RGB uses red, green, and blue; meanwhile, the CMYK color processing uses cyan, magenta, yellow, and black. These primary colors are mixed to create more color spectrums. They seem similar, but they are different especially if you design and print in different color processing. 

Design software that is used to make a poster design usually has the default of RGB color processing. Meanwhile, printers these days use CMYK inks that are combined to print colors on the paper stock. If you design in RGB and print in CMYK, you won't be able to get a result that is accurate, meaning that it is likely that the colors you see on your screen as you design your poster and the colors you get after the printing process may differ slightly. 

So in order to avoid this inaccuracy, make sure that you design and print using the same color processing, which is commonly the CMYK as the perfect color processing for the production of poster design. 

If you have already designed your poster in RGB while you should have used CMYK, you can still convert the RGB colors to CMYK that can be found in Adobe Photoshop using Gamut Warning Tool. 

2. Poster Design Resolution 

If you want to get a high quality result, of course you have to make sure that the design you make supports it. The poster design must be of high resolution so that it can ensure high quality printing. The ideal resolution for high quality poster design is 300 dpi. If you don't know whether or not your design is right for high quality printing, then try to zoom in your design to 600% and see if the image gets broken; either pixelated or stretched. If yes, then the images and other elements in your design must be changed to 300 dpi. But if not, then your design is just perfect for the best quality printing. 

3. Poster Size 

Knowing the size of the poster that you want before you start designing it is crucial, so that you can make sure that you are designing in the right measurements. This also ensures high quality printing because with accurate dimensions and measurements, your poster design will has less chance of getting stretched or pixelated. With this, you can attractive poster printing that appeals to your target audience.