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24HourForums.com > Supported Forums > Nancy's Graphic Design & Forum Software > Graphic Tip of the Day

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 Moderated by: ClassicNancy

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ClassicNancy
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 Posted: 12:23 am

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It is generally not a good idea to rotate raster images (bitmaps, such as TIFF, PCX, BMP, and GIF) at anything other than 90 degree increments because it causes pixel distortion.
However, sometimes other orientations are necessary. When you must rotate, heed these tips:
  • Always save an original version of the image and rotate a copy so you have a 'clean' copy to go back to if the distortion is too much.


  • If you rotate once but then decide you want to rotate it just a little more or less, go back to the original orientation and rotate the desired amount (that is instead of one rotation of 20 degrees then a second rotation of 5 degrees, go back to the original orientation and rotate once to 25 degrees). This way you limit the amount of distortion.


  • Use blur, sharpen, or other filter effects selectively on those areas of the image that need a little tweaking after rotation (to minimize the distorted pixels).




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 Posted: 05:49 am

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Know the difference between a Gif and a Jpeg





Most browsers recognize graphics in GIF and JPEG formats. Just use the .GIF, .JPG, or .JPEG file extension and the browser will know how to handle it. So when should you use GIF and when should you use JPEG?

Both GIF and JPEG files are compressed. GIF uses a lossless compression scheme which is optimized for images with regions of solid color. JPEG uses a lossy compression scheme which is optimized for images with many mixed colors (like photographs).

GIF files only require additional size when the color of horizontally adjacent pixels changes. In other words, a horizontal line of a single color takes the same amount of space no matter how long it is. This makes GIF format ideal for solid color images like logos, cartoons, and text stored as graphics.

JPEG files use a lossy compression technique (slightly adjusting the colors) to give a visually similar image that takes less space. You can choose how much compression (and color change) you want. For natural, photographic, or multi-color images, JPEG does a good job.


Choose GIF file format when you have a solid color image, and choose JPEG when you have a photographic image. When in doubt, try both formats and choose the one that gives the best image quality for the lowest file size.




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 Posted: 01:52 am

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I think these are great tips! More and more people are getting used to dealing with graphics on the net, and in forums especially. So, these are perfect for the average person looking to brush up!




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 Posted: 04:45 pm

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This is a good site for tutorials on Photoshop, Paint Shop Pro, Xara Xtreme Pro and Corel Draw.

http://www.grafx-design.com/




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 Posted: 05:00 pm

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ClassicNancy wrote: If you rotate once but then decide you want to rotate it just a little more or less, go back to the original orientation and rotate the desired amount (that is instead of one rotation of 20 degrees then a second rotation of 5 degrees, go back to the original orientation and rotate once to 25 degrees). This way you limit the amount of distortion.

This is excellent advice!  I discovered this when using PhotoShop with .gif images and it is absolutely true.  Nancy knows her stuff!




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