在 PTXPrint 出版物中使用 GIF 檔案？

Question

我購買了一組圖片，用於 SU 出版物等用途。說明中指出：「圖片為高解析度黑白 TIFF 檔案，適用於列印（最大 A4 尺寸，300 DPI），以及彩色 JPEG 檔案……」

然而，這組黑白圖片的格式為 .gif，PTXPrint 似乎無法識別。我可以使用 ImageMagick 之類的工具將「gif > tif」轉換為「高解析度」結果以用於列印嗎？
任何有助於未來參考的說明都將不勝感激！

謝謝！

機器翻譯自 English 顯示原文

Answer 1

If the images are actually the claimed resolution, then they should be (at least) 3508 x 2048 pixels.
You can verify that with ImageMagick’s identify command.

ImageMagick’s convert utility should be able to convert the .TIFF files (or GIFs - really?) would certainly be able to turn .GIF or .TIFF into .PNG, which is what you want to use, and unless you tell it to (or you are converting from a vector graphic format) it won’t alter the resolution.

I don’t know how recent it is, but the -format flag for mogrify saves a lot of typing:

mogrify -format png *.gif

I’ve tested it on my Ubuntu 22.04 and (despite mogrify normally being modify-in-place) this did produce a new copy of the files in the relevant format. Obviously, having a backup is a sensible precaution, anyway.