0
votes
1answer
92 views

How can I convert a large PDF to PNG?

I want to convert a very large PDF file (>2GB) to a PNG (or JPEG) file so that it is easier to open and look at. I want to do that without opening the PDF file since it is too large to be opened. Is ...
1
vote
0answers
126 views

Image optimization: Photoshop CS6 vs jpegtran / OptiPNG

Is there any difference in terms of algorithm for optimization between Photoshop's Shift+Alt+S (save for web) and jpegtran's -optimize and -progressive? It seems my images are not reduced (or reduced ...
-2
votes
2answers
887 views

PNG file size is too big after converting from JPG

I try to convert a JPG file to PNG, but the size is still too big, about 7 MB. What's wrong? I used Microsoft Paint to convert it. The original file is only 500 KB in JPEG, yet the PNG file is 7 MB. ...
2
votes
3answers
4k views

How to convert GIF files to PNG or JPEG in OS X with command line?

I have 10k+ GIF files that I need to convert to PNG or JPEG preferably using command line so that I can automate it. I'm not worried about losing quality or transparency, just need to prepare files ...
0
votes
1answer
803 views

convert serveral image files to a single djvu file

Suppose I have serveral BMP image file, say 001.bmp, 002.bmp,..., 100.bmp. I want to convert these files to a single djvu file, whose first page is the content of 001.bmp, the second page is the ...
1
vote
1answer
88 views

Most space-efficient format for image with large dimensions but few colors?

Recently I have had to scale up the dimensions of a gif image by a factor of 2, this resulted in an increase of the file size by about 8 times. While this is not a complete surprise, I can't help but ...
4
votes
2answers
389 views

Automating the choice between JPEG and PNG with a script

Choosing the right format to save your images in is crucial for preserving image quality and reducing artifacts. Different formats follow different compression methods and come with their own set of ...
1
vote
4answers
172 views

How do I explain to my mother how to convert a bunch of PNG files into JPEGs?

Mom asked me to scan in a bunch of photos for her previously, and I scanned them in as PNG files; namely because most any software package can read them, and they don't throw away any of the photo's ...
2
votes
2answers
738 views

What meta-information is contained in an image file?

I'm wondering what information is contained in an image file like JPEG or PNG. I know that most of them contain a metadata file, but anything else other than that? Anything relates to the license ...
0
votes
1answer
271 views

Paint for Windows seven 64 bits: How to change the default save format from png to jpg [duplicate]

Possible Duplicate: Is it possible to change MS paint's default save file type to PNG When I copy an image in Paint and want so save it, the default format is png. How is it possible ...
0
votes
3answers
376 views

Tool to repair line drawings / diagrams wrongly saved as jpgs

When you compress a line drawing as a jpg, it goes kind of blurry. Areas of solid colour become areas of slightly variable colour etc. Are there any tools out there that attempt to fix this kind of ...
1
vote
3answers
8k views

Which is the best utility for opening .jpeg, .png and .tiff files on Linux? [closed]

Which is the most commonly used utility?
1
vote
4answers
5k views

best freeware for doing batch conversion of jpg to png [closed]

Which is the best freeware for converting jpg files in different folder to png in a batch process on a windows xp?
56
votes
6answers
62k views

Batch converting PNG to JPG in linux

Does anyone know a good way to batch-convert a bunch of PNGs into JPGs in linux? (I'm using Ubuntu). A png2jpg binary that I could just drop into a shell script would be ideal.
14
votes
3answers
816 views

Is there still any reason to prefer GIF over PNG when creating images for web pages? [closed]

Long ago, I used to avoid the PNG image format when building web pages because browser support was lacking. I remember having a PNG on a page could cause the QuickTime plugin to be loaded - yuck. ...
27
votes
8answers
30k views

JPEG vs PNG vs BMP vs GIF

I would like to know which one of these formats requires less memory for the same quality of the picture, and what the main differences between the formats are.