how to change jpg to png for album of pics

#How to change jpg to png for album of pics software#

If you are converting an image with many colours (perhaps because somebody saved the original as a JPEG, avoid this) to a PNG, you may want to reduce the number of colours at the same time see Wikipedia:How to reduce colors for saving a JPEG as PNG.Īn anti-aliased image may use more colours than you notice, because anti-aliasing smooths jagged edges by adding shades of grey where once there was black or white. Use the lowest bit depth that can handle all colours in your image, although some image editing programs cannot create 2-bit colour images. Paletted images can have a bit depth of 1, 2, 4, or 8 bit (2, 4, 16, or 256 colour). The lower colour depth versions of PNG store colours in a palette. If a diagram has 4 colours, there is no need to store it in a 24-bit ( truecolour) format capable of distinguishing 16 million colours. Adobe Photoshop has historically been known as being poor at creating PNG files.Ĭhoose a colour depth appropriate for the number of coloursĭoes the number of bits per pixel fit the number of colors in the image? Diagrams usually have few colours.Many people compare a 24 bit PNG with an 8 bit GIF, which is an invalid comparison.There is a delusion among many web designers that PNGs are larger than GIFs. There are some things that need to be done by hand. But it does not automatically give you the smallest possible file size. It is therefore a good format for diagrams and cartoons. The PNG compression algorithm is designed to work with large areas of solid colour that have sharp boundaries. If a diagram cannot be produced in SVG, then a PNG image is preferred over a JPEG. However, it is not always easy to convert raster images like GIFs, PNGs, or JPEGs to SVG, and some images (especially photos) are not conducive to this treatment. The editability and scalability of SVG (Scalable Vector Graphics) make the format the obvious choice for graphic representation of data and illustrations. 1.1 Choose a colour depth appropriate for the number of colours.TIFF - Should usually be converted to PNG or JPEG as discussed above. Other image formats should be avoided in most cases:īMP - Images are uncompressed, resulting in larger file sizes. While some formats offer multiple compression systems, in general the format and the compression system are tied together. SVG for simple diagrams (especially those that need to be scaled). There are 4 basic choices for image file formats:

#How to change jpg to png for album of pics software#

Data formats and code that are compatible with free software should be preferred. In any of the above cases, there should be a note saying what specific software is required to edit the image.in a computer algebra system), the code should be included so minor improvements like labels and color adjustments can be made. If the image was generated from a script (e.g.spreadsheet) should be included so new data can be added to the graph, and/or the source of the data should be cited. a graph in Microsoft Excel), the data and file (e.g.

If the image was generated from data (e.g.

Don't try to save disk space on the images server by giving up useful information. When uploading image files to Wikipedia or, preferably, to the Wikimedia Commons, it is important to use the right file format for the content.