1.联合图像专家组(JPEG):
自1982年6月以来,ISO的第8工作组(WG8)一直在研究静态图像压缩和解压缩的标准。 1987年6月,提出了十种不同的彩色和灰度静态图像编码技术。基于离散余弦变换(DCT)的自适应变换编码技术获得了最佳的主观效果。
PEG适用于彩色和灰度静态图像。视频序列也可以通过静态图像的节庆编码和解码来处理,这种技术称为Motion JPEG。
2. Photoshop文件(PSD):
PSD代表“ Photoshop文档”,它是一种特定于应用程序的专有格式,但是由于Photoshop在像素编辑世界中的主导地位,PSD已成为一种准标准。许多其他程序,甚至某些不是Adobe提供的程序,都将PSD作为一种附加文件格式支持-但通常以只读或导入/导出目的,而不是其真正的本机文件格式。
JPEG和PSD之间的区别:
S.No. | JPEG | PSD |
---|---|---|
1. | JPEG is the actually a standard format that is not tied to any application. Virtually all programs that deal with images are able to open and save in the JPEG format. | PSD is the native file format for a Photoshop. In PSD, you only have Photoshop that can open the file. |
2. | It is a standard image format. | It is the document format for Photoshop. |
3. | It can be viewed in a lot of applications. | It can not viewed in a lot of applications. |
4. | It does not support layers. | It supports layers. |
5. | It is supported by gadgets. | It is not supported by gadgets. |
6. | It is less longer then PSD. | It is lot larger than JPEG. |
7. | A JPEG is just a compressed bitmap. | while a PSD is PhotoShop file and thus retains all the project information such as the layers and history. |
8. | It is compressed single layer image. | It is PhotoShop Document. It is an image with the editing layers saved with it. |
9. | It is less popular photo editing software. | It is very popular photo editing software. |