It also requires some basic knowledge of image-editing software such as Adobe Lightroom , because files will have to be edited and converted out of the RAW format before they can be used i. Just about every camera these days uses a different proprietary format to capture RAW files. Even cameras from the same manufacturer will often use different formats, which means image editing software must be able to read files from all of these different cameras. As a result, editing software providers face a challenge: how to manage and continuously provide updates for their program so it can read all these different file formats.
Enter the DNG. This file format, created by Adobe, is an attempt to provide a standard RAW file for all manufacturers and cameras. One of the problems with keeping images in the original RAW format is that, several years from now, you may be unable to access these files, because they are specific to cameras and manufacturers. This does add another step to the post-processing workflow, which takes extra time.
PNGs are compressed in a lossless format, and therefore retain all detail. The image pixels fit the screen pixels one for one, so to speak. A x image will show as x pixels on the screen. If the image size is larger than the screen size, we normally are shown a temporary resampled copy of more suitable smaller size. However, print paper is dimensioned in inches or mm, so images for printing must be scaled to be spaced out so many pixels per inch or mm often called dpi, jargon for pixels per inch on paper.
See basic differences, and more detail between using images printed or on the video screen. Note that uncompressed bit RGB data is three bytes per pixel , regardless of image size. Compressed files are uncompressed again when opened into computer memory for showing the count of pixels remains unchanged. Bytes KB. These are not the only choices, but they are good and reasonable choices. Compression varies with type of compression, but degree of compression also varies with the image content bland areas with sparse detail, like walls or sky, compress very effectively, But high detail areas compress less effectively.
Wide-range tonal shifts gamma and white balance in the initial editing processing can benefit from more than 8-bits. Scanners and cameras are at least bits for this reason. However our monitors and printers expect 8-bit data. And JPG is only 8-bits.
PNG-8 is Indexed color for graphics, a maximum of colors. Documents - images of graphics and text - line art, multi-page, fax, etc - this will be TIF files. See Properties chart above. We select the file type that supports the properties we need. The only reason for using lossy compression is for smaller file size, usually for internet transmission speed or storage space.
On the web, JPG is the clear choice for photo images smallest file, with image quality being less important than file size , and GIF is common for graphic images, but indexed color is not normally used for color photos PNG can do either on the web. Other than the web, TIF file format has been the undisputed leader when best quality is desired, largely because TIF is so important in commercial printing environments.
High Quality JPG can be pretty good too, but don't ruin them by making the files too small. If the goal is high quality, you don't want small.
Adobe RGB color space may be OK for your home printer and profiles, but if you send your pictures out to be printed, the mass market printing labs normally only accept JPG files, and only process sRGB color space.
What are JPG artifacts? Something we all need to know, but it takes more to show this, so it was placed on its own page. Difference in photo and graphics images Photo images have continuous tones , meaning that adjacent pixels often have very similar colors, for example, a blue sky might have many shades of blue in it.
Normally this is bit RGB color, or 8-bit grayscale, and a typical color photo may contain perhaps a hundred thousand RGB colors, out of the possible set of 16 million colors in bit RGB color.
Graphic images are normally not continuous tone gradients are possible in graphics, but are seen less often. Graphics are drawings, not photos, and they use relatively few colors, maybe only two or three, often less than 16 colors in the entire image. In a color graphic cartoon, the entire sky will be only one shade of blue where a photo might have dozens of shades.
A map for example is graphics, maybe 4 or 5 map colors plus 2 or 3 colors of text, plus blue water and white paper, often less than 16 colors overall. These few colors are well suited for Indexed Color , which can re-purify the colors. Don't cut your color count too short though, there will be more colors than you count. Insufficient colors can rough up the edges. Line art is a special case, only two colors black or white, with no gray , for example clip art, fax, and text.
Low resolution line art like cartoons on the web is often better as grayscale, to add anti-aliasing to hide the jaggies. JPG files are very small files for continuous tone photo images, but JPG is poor for graphics, without a high Quality setting.
Photos provided by author. CMYK — by Owley. No compression. High compression. Trauby mascot by ktoons. Logo design by spoon design. Oakland poster by Martis Lupus.
Yoga poster by Trisixtin for yogawithleo. Want to find a designer who can create all the right file types? Our designers can do that! Find a designer. You're in! You proved us right again. Our newsletter is only for the coolest kids. Get ready for amazing stuff in your inbox. Looks like something went wrong. I'm a freelance designer Our newsletter is for everyone who loves design!
Sign me up! Join the community. Current design contests Designers, check out these contests so you can start building your career. Designers, see opportunities. Believe it or not, something as simple as file type can make printing your photos a breeze — or a pain! In this guide, we will share the best image format and their features.
This most used image file format is used to store photos all over the world, and is generally a default file format for saving images. In fact, most of the images you find online will download as. JPEG files come in different quality levels like low, medium and high. Low quality JPEGs are more compressed than high quality versions.
Most commonly, JPEG images are great for sharing on social media, via email and on websites. These files are relatively small, so they take up less space on your memory cards and computer storage. Beware, though, that saving images as JPEGs can compromise the quality of that image.
You can use PNGs for completely transparent backgrounds or drop shadows partial transparency for the great effects. This image format will not sacrifice the quality and details of the photos, but that means that they are typically larger in size than JPEGs. Thus, PNGs are best for small images like logos. With GIF image files, you can also create short animations for web. PSD stands for Photoshop Document. You can then use that file to edit the individual layers you created in Photoshop at a later time.
0コメント