Overview unwantedly convert a color to transparent (!)

Hello

I use a snippet to open png files and save them to gif format (to reduce the size of the file).

The files are a book cover, including an orange background, with red, white and dark gray text and graphics (curves).

Yesterday, it worked well.

Today when I save as gif red color in the image disappears. I guess that it is transformed into Transparent. I see where the red text and graphic lines were is the background orange.

Preview was not doing this yesterday.

Today it is the same on the png files that I created yesterday, so I'm sure that change is in the preview, not Inkscape (which I used to create the PNG).

I do not use the lasso or other tool to select all areas of the picture and enable transparency.

I open the image, choose the export file to gif format and with the box checked and checked alpha, the color red is disappearing and I don't want it.

Any suggestions much appreciated.

Overview 8.1 (877.7)

10.11.6 OSX

Thank you.

Do not use the gif. It is an older format, limited to 256 colors. It is quite insufficient for most uses (with the exception perhaps of dubious of these short "animations").

One of the unique features of gif should have 'transparency' - but which has been achieved by stipulating a particular table as color being transparent (and not, as in modern formats, by adding a fourth channel, called "alpha channel" to the series of red, green and blue).

Somehow the red in your translation got to be designated 'transparent color '.

If you want to reduce the size of the file, try saving to jpeg and quality change to achieve a good balance between size and quality.

Tags: Mac OS & System Software

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