TweakPNG

Name: TweakPNG
Works on: windows

Windows 2000 and above

Version: 1.4
Last Updated: 03 Apr 2017
Release: 24 Sep 2014
Category: Multimedia > Graphic

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TweakPNG Tags

PNG tweaker modify PNG PNG editor PNG tweaker tweak modifier

TweakPNG Details

Rating: 2.173913043 out of 5 based on 23 user ratings

Publisher Website: External Link
Downloads: 348
License: Free

TweakPNG is a free software by Jason Summers and works on Windows 10, Windows 8.1, Windows 8, Windows 7, Windows XP, Windows 2000, Windows 2003, Windows 2008, Windows Vista, Windows 2012.
You can download TweakPNG which is 495.31 KB in size and belongs to the software category Graphic.
TweakPNG was released on 2014-09-24 and last updated on our database on 2017-04-03 and is currently at version 1.4.

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TweakPNG Description

Move Up/Down:
You can rearrange chunks by selecting Edit|Move Up or Down from the menu.
Use the Check Validity function to make sure you leave them in a legal order. Note that you can select multiple chunks and move them together.
Copy, Cut, Paste:
Use these functions to copy chunks to the clipboard and back. They support multiple chunks at a time. The system clipboard is used, so you can copy chunks from one file to another.
Unlike in most programs, Paste does not delete the currently selected chunk(s). Pasted chunks are inserted just before the first selected chunk.
Combine IDAT Chunks:
IDAT chunks contain the actual image. The PNG specification allows for the image data to be split up among any number of IDAT chunks, which much occur consecutively in the file. For efficiency reasons, some applications do not write IDAT chunks larger than some fixed size (say, 8192 bytes).
TweakPNG allows you to consolidate IDAT chunks if there are more than one. This saves 12 bytes of file size per chunk that you eliminate. Choose Edit|Combine all IDAT, or select a range of IDAT chunks and then Edit|Combine IDAT chunks.
Split IDAT chunks:
You can also do the reverse: split up an IDAT chunk into two or more pieces. Why you'd want to do that, I'm not sure, but it's provided for completeness. Select a chunk and choose Edit|Split IDAT chunk. Enter the byte size of the first chunk. To divide it into two chunks, leave the "Repeat..." checkbox unchecked. To split it into many chunks of that size, check "Repeat...". It is legal to have an IDAT chunk of length zero. Such a chunk can be safely deleted.
Import and Export:
Import allows you to read a chunk from an external datafile and insert it into the current image. The first four characters of the datafile must be the chunk identifier (e.g. "PLTE"), and the remainder of the file must be the data. The file must not contain length or CRC information. This function allows you to insert any chunk you want into a PNG file, including private unregistered chunks. However, you will often have to use a separate file editor to create the chunk. A sample chunk file, sample.chunk, has been included.
Export will create a file in the format described above, from an existing chunk in a PNG file. It works only on one chunk at a time.
Editing Palettes:
When you edit a PLTE chunk, or a bKGD or tRNS chunk in a paletted image, TweakPNG's palette editor will be opened.
To edit a color, make sure neither the "Set bkgd" nor the "Edit alpha" button is pressed down, and click on a palette entry. Select a new color and press OK.
To change the size of the palette, simply type a new value into the "Colors in palette" field. Note that if you decrease the palette size, you will end up with an illegal image if any of the colors you removed are used in the image.
Alpha values control the "degree of transparency" of a palette color. A value of 0 is completely transparent (invisible), and a value of 255 is completely opaque. A short vertical line at the bottom of each palette entry indicates its approximate alpha value. (If there is no line, it means that no alpha value exists for this entry, and the color is therefore completely opaque.) The line is red unless the value is exactly 0 or 255, in which case it is a bluish color.
To edit alpha values, press the "Edit alpha" button. The button stays down until you press it again. If the button is disabled, you need to Insert a tRNS chunk first. Now click a palette entry, and type the desired alpha value.
To change the number of alpha values (the size of the tRNS chunk), type a new value into the "Alpha colors" field. There must not be more alpha values than there are colors in the palette, but there can be less. Alpha values of 255 at the end of the palette are a waste of space, since that is the default if they are missing. To decrease the number to zero, don't use the palette editor; just delete the tRNS chunk.
One palette entry can be designated as the background color. It is indicated by a thick blue border. To change the background color, press the "Set bkgd" button, then click on the palette entry that you want to use as the background. If the button is disabled, you need to Insert a bKGD chunk first. If the desired background color is not in the palette, and there is room for another color in the palette, you can increase the palette size by one and use the new entry as the background. To remove the background color, delete the bKGD chunk.
Some grayscale images also use the palette editor, with a simulated grayscale palette, to set the background or transparent color. It is not a real palette, so you can't edit the colors, but you can visually select the desired background or transparent color.
File Signature:
Every file type in the PNG family begins with an 8-byte signature that identifies it. Choosing File|File Signature from the menu will let you choose which signature will be written when you save the file: either PNG, MNG, or JNG. This is for completeness only; you probably will never need this.
Check Validity:
This will take a look at the overall structure of the current file and try to determine if it could be a valid PNG file. It mostly checks for incorrect chunk ordering and missing required chunks. It does not guarantee that your file is valid (not even close). It does not check that the data within chunks is valid. This function will automatically be run before you save a file, and if any problems are found, you will need to confirm the save.

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